31325131 has 2 divisors, whose sum is σ = 31325132. Its totient is φ = 31325130.

The previous prime is 31325117. The next prime is 31325143. The reversal of 31325131 is 13152313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31325131 is a prime.

It is a super-2 number, since 2×31325131² = 1962527664334322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31325099 and 31325108.

It is not a weakly prime, because it can be changed into another prime (31325831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15662565 + 15662566.

It is an arithmetic number, because the mean of its divisors is an integer number (15662566).

Almost surely, 2^31325131 is an apocalyptic number.

31325131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31325131 is an equidigital number, since it uses as much as digits as its factorization.

31325131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 19.

The square root of 31325131 is about 5596.8858305311. The cubic root of 31325131 is about 315.2324847937.

Adding to 31325131 its reverse (13152313), we get a palindrome (44477444).

The spelling of 31325131 in words is "thirty-one million, three hundred twenty-five thousand, one hundred thirty-one".