31125465 has 40 divisors (see below), whose sum is σ = 63771840. Its totient is φ = 14227488.

The previous prime is 31125461. The next prime is 31125481. The reversal of 31125465 is 56452113.

31125465 is a `hidden beast` number, since 3 + 112 + 546 + 5 = 666.

It is not a de Polignac number, because 31125465 - 2² = 31125461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31125461) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2655 + ... + 8324.

It is an arithmetic number, because the mean of its divisors is an integer number (1594296).

Almost surely, 2^31125465 is an apocalyptic number.

31125465 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31125465 is an abundant number, since it is smaller than the sum of its proper divisors (32646375).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31125465 is a wasteful number, since it uses less digits than its factorization.

31125465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11003 (or 10994 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 31125465 is about 5579.0200752462. The cubic root of 31125465 is about 314.5612940522.

Adding to 31125465 its reverse (56452113), we get a palindrome (87577578).

The spelling of 31125465 in words is "thirty-one million, one hundred twenty-five thousand, four hundred sixty-five".