1561125356 has 24 divisors (see below), whose sum is σ = 3123378720. Its totient is φ = 668812032.

The previous prime is 1561125341. The next prime is 1561125383. The reversal of 1561125356 is 6535211651.

It is a super-2 number, since 2×1561125356² = 4874224754292253472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84350 + ... + 101178.

It is an arithmetic number, because the mean of its divisors is an integer number (130140780).

Almost surely, 2^1561125356 is an apocalyptic number.

It is an amenable number.

1561125356 is an abundant number, since it is smaller than the sum of its proper divisors (1562253364).

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

1561125356 is a wasteful number, since it uses less digits than its factorization.

1561125356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20153 (or 20151 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 1561125356 is about 39511.0789019991. The cubic root of 1561125356 is about 1160.0568135075.

The spelling of 1561125356 in words is "one billion, five hundred sixty-one million, one hundred twenty-five thousand, three hundred fifty-six".