30690731 has 2 divisors, whose sum is σ = 30690732. Its totient is φ = 30690730.

The previous prime is 30690727. The next prime is 30690743. The reversal of 30690731 is 13709603.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30690731 - 2² = 30690727 is a prime.

It is a super-2 number, since 2×30690731² = 1883841938628722, 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 = 30690694 and 30690703.

It is not a weakly prime, because it can be changed into another prime (30690701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15345365 + 15345366.

It is an arithmetic number, because the mean of its divisors is an integer number (15345366).

Almost surely, 2^30690731 is an apocalyptic number.

30690731 is a deficient number, since it is larger than the sum of its proper divisors (1).

30690731 is an equidigital number, since it uses as much as digits as its factorization.

30690731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 30690731 is about 5539.9215698419. The cubic root of 30690731 is about 313.0899141833.

The spelling of 30690731 in words is "thirty million, six hundred ninety thousand, seven hundred thirty-one".