1561210112 has 72 divisors (see below), whose sum is σ = 3885333312. Its totient is φ = 608256000.

The previous prime is 1561210051. The next prime is 1561210117. The reversal of 1561210112 is 2110121651.

It is a super-2 number, since 2×1561210112² = 4874754027622105088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561210117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19889 + ... + 59312.

Almost surely, 2^1561210112 is an apocalyptic number.

It is an amenable number.

1561210112 is an abundant number, since it is smaller than the sum of its proper divisors (2324123200).

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

1561210112 is an equidigital number, since it uses as much as digits as its factorization.

1561210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79235 (or 79221 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 1561210112 is about 39512.1514473712. The cubic root of 1561210112 is about 1160.0778069094.

Adding to 1561210112 its reverse (2110121651), we get a palindrome (3671331763).

The spelling of 1561210112 in words is "one billion, five hundred sixty-one million, two hundred ten thousand, one hundred twelve".