30872971 has 2 divisors, whose sum is σ = 30872972. Its totient is φ = 30872970.

The previous prime is 30872957. The next prime is 30872981. The reversal of 30872971 is 17927803.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30872971 - 2⁵ = 30872939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30872971.

It is not a weakly prime, because it can be changed into another prime (30872921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15436485 + 15436486.

It is an arithmetic number, because the mean of its divisors is an integer number (15436486).

Almost surely, 2^30872971 is an apocalyptic number.

30872971 is a deficient number, since it is larger than the sum of its proper divisors (1).

30872971 is an equidigital number, since it uses as much as digits as its factorization.

30872971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 30872971 is about 5556.3451116719. The cubic root of 30872971 is about 313.7083956198.

The spelling of 30872971 in words is "thirty million, eight hundred seventy-two thousand, nine hundred seventy-one".