1051531320 has 128 divisors (see below), whose sum is σ = 3613040640. Its totient is φ = 239831040.

The previous prime is 1051531309. The next prime is 1051531321. The reversal of 1051531320 is 231351501.

1051531320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1051531320² = 2211436233881884800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051531321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497065 + ... + 499175.

It is an arithmetic number, because the mean of its divisors is an integer number (28226880).

Almost surely, 2^1051531320 is an apocalyptic number.

1051531320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1051531320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1806520320).

1051531320 is an abundant number, since it is smaller than the sum of its proper divisors (2561509320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1051531320 is a wasteful number, since it uses less digits than its factorization.

1051531320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2725 (or 2721 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1051531320 is about 32427.3236638487. The cubic root of 1051531320 is about 1016.8902209577.

Adding to 1051531320 its reverse (231351501), we get a palindrome (1282882821).

The spelling of 1051531320 in words is "one billion, fifty-one million, five hundred thirty-one thousand, three hundred twenty".