30685631 has 2 divisors, whose sum is σ = 30685632. Its totient is φ = 30685630.

The previous prime is 30685619. The next prime is 30685651. The reversal of 30685631 is 13658603.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30685631 - 2¹⁰ = 30684607 is a prime.

It is a super-2 number, since 2×30685631² = 1883215899736322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30685651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15342815 + 15342816.

It is an arithmetic number, because the mean of its divisors is an integer number (15342816).

Almost surely, 2^30685631 is an apocalyptic number.

30685631 is a deficient number, since it is larger than the sum of its proper divisors (1).

30685631 is an equidigital number, since it uses as much as digits as its factorization.

30685631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 30685631 is about 5539.4612553930. The cubic root of 30685631 is about 313.0725707600.

The spelling of 30685631 in words is "thirty million, six hundred eighty-five thousand, six hundred thirty-one".