31172001 has 32 divisors (see below), whose sum is σ = 48921600. Its totient is φ = 17288640.

The previous prime is 31171993. The next prime is 31172039. The reversal of 31172001 is 10027113.

It is not a de Polignac number, because 31172001 - 2³ = 31171993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31172041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172131 + ... + 172311.

It is an arithmetic number, because the mean of its divisors is an integer number (1528800).

Almost surely, 2^31172001 is an apocalyptic number.

It is an amenable number.

31172001 is a deficient number, since it is larger than the sum of its proper divisors (17749599).

31172001 is a wasteful number, since it uses less digits than its factorization.

31172001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 31172001 is about 5583.1891424167. The cubic root of 31172001 is about 314.7179839210.

Adding to 31172001 its reverse (10027113), we get a palindrome (41199114).

The spelling of 31172001 in words is "thirty-one million, one hundred seventy-two thousand, one".