1561331432 has 32 divisors (see below), whose sum is σ = 2944620000. Its totient is φ = 776115648.

The previous prime is 1561331423. The next prime is 1561331437. The reversal of 1561331432 is 2341331651.

It is a junction number, because it is equal to n+sod(n) for n = 1561331395 and 1561331404.

It is not an unprimeable number, because it can be changed into a prime (1561331437) 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, 1269794 + ... + 1271022.

It is an arithmetic number, because the mean of its divisors is an integer number (92019375).

Almost surely, 2^1561331432 is an apocalyptic number.

It is an amenable number.

1561331432 is a deficient number, since it is larger than the sum of its proper divisors (1383288568).

1561331432 is a wasteful number, since it uses less digits than its factorization.

1561331432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033 (or 2029 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 1561331432 is about 39513.6866414664. The cubic root of 1561331432 is about 1160.1078556075.

The spelling of 1561331432 in words is "one billion, five hundred sixty-one million, three hundred thirty-one thousand, four hundred thirty-two".