30724861 has 2 divisors, whose sum is σ = 30724862. Its totient is φ = 30724860.

The previous prime is 30724829. The next prime is 30724877. The reversal of 30724861 is 16842703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 3632836 = 5205^2 + 1906^2 .

It is a cyclic number.

It is not a de Polignac number, because 30724861 - 2⁵ = 30724829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30724801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15362430 + 15362431.

It is an arithmetic number, because the mean of its divisors is an integer number (15362431).

Almost surely, 2^30724861 is an apocalyptic number.

It is an amenable number.

30724861 is a deficient number, since it is larger than the sum of its proper divisors (1).

30724861 is an equidigital number, since it uses as much as digits as its factorization.

30724861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 30724861 is about 5543.0010824462. The cubic root of 30724861 is about 313.2059296685.

The spelling of 30724861 in words is "thirty million, seven hundred twenty-four thousand, eight hundred sixty-one".