1061531220 has 24 divisors (see below), whose sum is σ = 2972287584. Its totient is φ = 283074976.

The previous prime is 1061531209. The next prime is 1061531227. The reversal of 1061531220 is 221351601.

It is a super-2 number, since 2×1061531220² = 2253697062069376800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061531227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8846034 + ... + 8846153.

It is an arithmetic number, because the mean of its divisors is an integer number (123845316).

Almost surely, 2^1061531220 is an apocalyptic number.

1061531220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1061531220 is an abundant number, since it is smaller than the sum of its proper divisors (1910756364).

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

1061531220 is a wasteful number, since it uses less digits than its factorization.

1061531220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17692199 (or 17692197 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1061531220 is about 32581.1482302266. The cubic root of 1061531220 is about 1020.1035458126.

Adding to 1061531220 its reverse (221351601), we get a palindrome (1282882821).

The spelling of 1061531220 in words is "one billion, sixty-one million, five hundred thirty-one thousand, two hundred twenty".