31612165081 has 16 divisors (see below), whose sum is σ = 36350554240. Its totient is φ = 26929791360.

The previous prime is 31612165051. The next prime is 31612165121. The reversal of 31612165081 is 18056121613.

It is a cyclic number.

It is not a de Polignac number, because 31612165081 - 2⁷ = 31612164953 is a prime.

It is a super-2 number, since 2×31612165081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31612165051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898045 + ... + 932581.

It is an arithmetic number, because the mean of its divisors is an integer number (2271909640).

Almost surely, 2^31612165081 is an apocalyptic number.

It is an amenable number.

31612165081 is a deficient number, since it is larger than the sum of its proper divisors (4738389159).

31612165081 is a wasteful number, since it uses less digits than its factorization.

31612165081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35344.

The product of its (nonzero) digits is 8640, while the sum is 34.

Adding to 31612165081 its reverse (18056121613), we get a palindrome (49668286694).

The spelling of 31612165081 in words is "thirty-one billion, six hundred twelve million, one hundred sixty-five thousand, eighty-one".