31290629 has 2 divisors, whose sum is σ = 31290630. Its totient is φ = 31290628.

The previous prime is 31290613. The next prime is 31290631. The reversal of 31290629 is 92609213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18258529 + 13032100 = 4273^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 31290629 - 2⁴ = 31290613 is a prime.

Together with 31290631, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31290595 and 31290604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31290029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15645314 + 15645315.

It is an arithmetic number, because the mean of its divisors is an integer number (15645315).

Almost surely, 2^31290629 is an apocalyptic number.

It is an amenable number.

31290629 is a deficient number, since it is larger than the sum of its proper divisors (1).

31290629 is an equidigital number, since it uses as much as digits as its factorization.

31290629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 31290629 is about 5593.8027315950. The cubic root of 31290629 is about 315.1167082447.

The spelling of 31290629 in words is "thirty-one million, two hundred ninety thousand, six hundred twenty-nine".