31125135 has 16 divisors (see below), whose sum is σ = 52421760. Its totient is φ = 15726240.

The previous prime is 31125121. The next prime is 31125161. The reversal of 31125135 is 53152113.

31125135 = 2493² + 2494² + ... + 2497².

It is not a de Polignac number, because 31125135 - 2⁴ = 31125119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54321 + ... + 54890.

It is an arithmetic number, because the mean of its divisors is an integer number (3276360).

Almost surely, 2^31125135 is an apocalyptic number.

31125135 is a deficient number, since it is larger than the sum of its proper divisors (21296625).

31125135 is a wasteful number, since it uses less digits than its factorization.

31125135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109238.

The product of its digits is 450, while the sum is 21.

The square root of 31125135 is about 5578.9905000815. The cubic root of 31125135 is about 314.5601823623.

Adding to 31125135 its reverse (53152113), we get a palindrome (84277248).

The spelling of 31125135 in words is "thirty-one million, one hundred twenty-five thousand, one hundred thirty-five".