1561238532 has 72 divisors (see below), whose sum is σ = 4632170816. Its totient is φ = 434009664.

The previous prime is 1561238521. The next prime is 1561238533. The reversal of 1561238532 is 2358321651.

1561238532 is a `hidden beast` number, since 1 + 5 + 612 + 3 + 8 + 5 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1561238533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74398 + ... + 93045.

Almost surely, 2^1561238532 is an apocalyptic number.

1561238532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561238532 is an abundant number, since it is smaller than the sum of its proper divisors (3070932284).

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

1561238532 is a wasteful number, since it uses less digits than its factorization.

1561238532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167497 (or 167492 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1561238532 is about 39512.5110819345. The cubic root of 1561238532 is about 1160.0848461522.

The spelling of 1561238532 in words is "one billion, five hundred sixty-one million, two hundred thirty-eight thousand, five hundred thirty-two".