31325081 has 4 divisors (see below), whose sum is σ = 31629312. Its totient is φ = 31020852.

The previous prime is 31325071. The next prime is 31325093. The reversal of 31325081 is 18052313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31325081 - 2¹⁸ = 31062937 is a prime.

It is a super-2 number, since 2×31325081² = 1962521399313122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31325071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151961 + ... + 152166.

It is an arithmetic number, because the mean of its divisors is an integer number (7907328).

Almost surely, 2^31325081 is an apocalyptic number.

It is an amenable number.

31325081 is a deficient number, since it is larger than the sum of its proper divisors (304231).

31325081 is a wasteful number, since it uses less digits than its factorization.

31325081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304230.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 31325081 is about 5596.8813637596. The cubic root of 31325081 is about 315.2323170728.

Adding to 31325081 its reverse (18052313), we get a palindrome (49377394).

The spelling of 31325081 in words is "thirty-one million, three hundred twenty-five thousand, eighty-one".