31125105 has 48 divisors (see below), whose sum is σ = 59327424. Its totient is φ = 14970240.

The previous prime is 31125071. The next prime is 31125119. The reversal of 31125105 is 50152113.

It is not a de Polignac number, because 31125105 - 2⁹ = 31124593 is a prime.

It is a super-2 number, since 2×31125105² = 1937544322522050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112227 + ... + 112503.

It is an arithmetic number, because the mean of its divisors is an integer number (1235988).

Almost surely, 2^31125105 is an apocalyptic number.

It is an amenable number.

31125105 is a deficient number, since it is larger than the sum of its proper divisors (28202319).

31125105 is a wasteful number, since it uses less digits than its factorization.

31125105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 31125105 is about 5578.9878114224. The cubic root of 31125105 is about 314.5600812992.

Adding to 31125105 its reverse (50152113), we get a palindrome (81277218).

The spelling of 31125105 in words is "thirty-one million, one hundred twenty-five thousand, one hundred five".