1051491320 has 64 divisors (see below), whose sum is σ = 2586608640. Its totient is φ = 381520000.

The previous prime is 1051491319. The next prime is 1051491377. The reversal of 1051491320 is 231941501.

It is a super-2 number, since 2×1051491320² = 2211267992070684800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1051491320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218945 + ... + 223695.

It is an arithmetic number, because the mean of its divisors is an integer number (40415760).

Almost surely, 2^1051491320 is an apocalyptic number.

1051491320 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 1051491320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1293304320).

1051491320 is an abundant number, since it is smaller than the sum of its proper divisors (1535117320).

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

1051491320 is a wasteful number, since it uses less digits than its factorization.

1051491320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276 (or 5272 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1051491320 is about 32426.7068941636. The cubic root of 1051491320 is about 1016.8773267073.

The spelling of 1051491320 in words is "one billion, fifty-one million, four hundred ninety-one thousand, three hundred twenty".