31172135 has 16 divisors (see below), whose sum is σ = 40010112. Its totient is φ = 23232000.

The previous prime is 31172131. The next prime is 31172137. The reversal of 31172135 is 53127113.

It is not a de Polignac number, because 31172135 - 2² = 31172131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31172135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31172131) 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, 6770 + ... + 10400.

It is an arithmetic number, because the mean of its divisors is an integer number (2500632).

Almost surely, 2^31172135 is an apocalyptic number.

31172135 is a deficient number, since it is larger than the sum of its proper divisors (8837977).

31172135 is a wasteful number, since it uses less digits than its factorization.

31172135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3754.

The product of its digits is 630, while the sum is 23.

The square root of 31172135 is about 5583.2011427137. The cubic root of 31172135 is about 314.7184348828.

Adding to 31172135 its reverse (53127113), we get a palindrome (84299248).

The spelling of 31172135 in words is "thirty-one million, one hundred seventy-two thousand, one hundred thirty-five".