30947431 has 2 divisors, whose sum is σ = 30947432. Its totient is φ = 30947430.

The previous prime is 30947419. The next prime is 30947453. The reversal of 30947431 is 13474903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30947431 - 2¹⁹ = 30423143 is a prime.

It is a super-2 number, since 2×30947431² = 1915486970999522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30947393 and 30947402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30947461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15473715 + 15473716.

It is an arithmetic number, because the mean of its divisors is an integer number (15473716).

Almost surely, 2^30947431 is an apocalyptic number.

30947431 is a deficient number, since it is larger than the sum of its proper divisors (1).

30947431 is an equidigital number, since it uses as much as digits as its factorization.

30947431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 30947431 is about 5563.0415242024. The cubic root of 30947431 is about 313.9603956974.

The spelling of 30947431 in words is "thirty million, nine hundred forty-seven thousand, four hundred thirty-one".