30947971 has 2 divisors, whose sum is σ = 30947972. Its totient is φ = 30947970.

The previous prime is 30947957. The next prime is 30947981. The reversal of 30947971 is 17974903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30947971 - 2⁹ = 30947459 is a prime.

It is not a weakly prime, because it can be changed into another prime (30947981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15473985 + 15473986.

It is an arithmetic number, because the mean of its divisors is an integer number (15473986).

Almost surely, 2^30947971 is an apocalyptic number.

30947971 is a deficient number, since it is larger than the sum of its proper divisors (1).

30947971 is an equidigital number, since it uses as much as digits as its factorization.

30947971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 30947971 is about 5563.0900585915. The cubic root of 30947971 is about 313.9622217792.

The spelling of 30947971 in words is "thirty million, nine hundred forty-seven thousand, nine hundred seventy-one".