30723971 has 2 divisors, whose sum is σ = 30723972. Its totient is φ = 30723970.

The previous prime is 30723961. The next prime is 30723977. The reversal of 30723971 is 17932703.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30723971 - 2¹⁴ = 30707587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (30723977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15361985 + 15361986.

It is an arithmetic number, because the mean of its divisors is an integer number (15361986).

Almost surely, 2^30723971 is an apocalyptic number.

30723971 is a deficient number, since it is larger than the sum of its proper divisors (1).

30723971 is an equidigital number, since it uses as much as digits as its factorization.

30723971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 30723971 is about 5542.9208004445. The cubic root of 30723971 is about 313.2029054512.

The spelling of 30723971 in words is "thirty million, seven hundred twenty-three thousand, nine hundred seventy-one".