31145912171 has 4 divisors (see below), whose sum is σ = 33977358744. Its totient is φ = 28314465600.

The previous prime is 31145912131. The next prime is 31145912183. The reversal of 31145912171 is 17121954113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31145912171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31145912131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415723270 + ... + 1415723291.

It is an arithmetic number, because the mean of its divisors is an integer number (8494339686).

Almost surely, 2^31145912171 is an apocalyptic number.

31145912171 is a deficient number, since it is larger than the sum of its proper divisors (2831446573).

31145912171 is a wasteful number, since it uses less digits than its factorization.

31145912171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831446572.

The product of its digits is 7560, while the sum is 35.

The spelling of 31145912171 in words is "thirty-one billion, one hundred forty-five million, nine hundred twelve thousand, one hundred seventy-one".