309430631 has 2 divisors, whose sum is σ = 309430632. Its totient is φ = 309430630.

The previous prime is 309430621. The next prime is 309430663. The reversal of 309430631 is 136034903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309430631 - 2¹⁰ = 309429607 is a prime.

It is a super-2 number, since 2×309430631² = 191494630802116322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 309430594 and 309430603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309430621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154715315 + 154715316.

It is an arithmetic number, because the mean of its divisors is an integer number (154715316).

Almost surely, 2^309430631 is an apocalyptic number.

309430631 is a deficient number, since it is larger than the sum of its proper divisors (1).

309430631 is an equidigital number, since it uses as much as digits as its factorization.

309430631 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 29.

The square root of 309430631 is about 17590.6404374599. The cubic root of 309430631 is about 676.3753437355.

The spelling of 309430631 in words is "three hundred nine million, four hundred thirty thousand, six hundred thirty-one".