30705931 has 2 divisors, whose sum is σ = 30705932. Its totient is φ = 30705930.

The previous prime is 30705929. The next prime is 30705937. The reversal of 30705931 is 13950703.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30705931 - 2¹ = 30705929 is a prime.

It is a super-2 number, since 2×30705931² = 1885708397153522, which contains 22 as substring.

Together with 30705929, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 30705931.

It is not a weakly prime, because it can be changed into another prime (30705937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15352965 + 15352966.

It is an arithmetic number, because the mean of its divisors is an integer number (15352966).

Almost surely, 2^30705931 is an apocalyptic number.

30705931 is a deficient number, since it is larger than the sum of its proper divisors (1).

30705931 is an equidigital number, since it uses as much as digits as its factorization.

30705931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 28.

The square root of 30705931 is about 5541.2932606026. The cubic root of 30705931 is about 313.1415929922.

The spelling of 30705931 in words is "thirty million, seven hundred five thousand, nine hundred thirty-one".