31325540 has 24 divisors (see below), whose sum is σ = 68644800. Its totient is φ = 11985248.

The previous prime is 31325533. The next prime is 31325557. The reversal of 31325540 is 4552313.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 7 ways as a sum of consecutive naturals, for example, 33590 + ... + 34509.

It is an arithmetic number, because the mean of its divisors is an integer number (2860200).

Almost surely, 2^31325540 is an apocalyptic number.

It is an amenable number.

31325540 is an abundant number, since it is smaller than the sum of its proper divisors (37319260).

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

31325540 is a wasteful number, since it uses less digits than its factorization.

31325540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68131 (or 68129 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 31325540 is about 5596.9223685879. The cubic root of 31325540 is about 315.2338567435.

Adding to 31325540 its reverse (4552313), we get a palindrome (35877853).

The spelling of 31325540 in words is "thirty-one million, three hundred twenty-five thousand, five hundred forty".