31025213 has 2 divisors, whose sum is σ = 31025214. Its totient is φ = 31025212.

The previous prime is 31025207. The next prime is 31025243. The reversal of 31025213 is 31252013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23396569 + 7628644 = 4837^2 + 2762^2 .

It is a cyclic number.

It is not a de Polignac number, because 31025213 - 2²⁰ = 29976637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31025191 and 31025200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31025243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15512606 + 15512607.

It is an arithmetic number, because the mean of its divisors is an integer number (15512607).

Almost surely, 2^31025213 is an apocalyptic number.

It is an amenable number.

31025213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31025213 is an equidigital number, since it uses as much as digits as its factorization.

31025213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 31025213 is about 5570.0280968771. The cubic root of 31025213 is about 314.2232073546.

Adding to 31025213 its reverse (31252013), we get a palindrome (62277226).

The spelling of 31025213 in words is "thirty-one million, twenty-five thousand, two hundred thirteen".