31161636441 has 56 divisors (see below), whose sum is σ = 50371246016. Its totient is φ = 19154970720.

The previous prime is 31161636437. The next prime is 31161636461. The reversal of 31161636441 is 14463616113.

31161636441 is a `hidden beast` number, since 3 + 1 + 1 + 6 + 1 + 6 + 3 + 644 + 1 = 666.

It is not a de Polignac number, because 31161636441 - 2² = 31161636437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31161636396 and 31161636405.

It is not an unprimeable number, because it can be changed into a prime (31161636421) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 14621946 + ... + 14624076.

It is an arithmetic number, because the mean of its divisors is an integer number (899486536).

Almost surely, 2^31161636441 is an apocalyptic number.

It is an amenable number.

31161636441 is a deficient number, since it is larger than the sum of its proper divisors (19209609575).

31161636441 is a wasteful number, since it uses less digits than its factorization.

31161636441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705 (or 3690 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The spelling of 31161636441 in words is "thirty-one billion, one hundred sixty-one million, six hundred thirty-six thousand, four hundred forty-one".