30475721 has 2 divisors, whose sum is σ = 30475722. Its totient is φ = 30475720.

The previous prime is 30475699. The next prime is 30475763. The reversal of 30475721 is 12757403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21855625 + 8620096 = 4675^2 + 2936^2 .

It is a cyclic number.

It is not a de Polignac number, because 30475721 - 2⁶ = 30475657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30475021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15237860 + 15237861.

It is an arithmetic number, because the mean of its divisors is an integer number (15237861).

Almost surely, 2^30475721 is an apocalyptic number.

It is an amenable number.

30475721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30475721 is an equidigital number, since it uses as much as digits as its factorization.

30475721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 30475721 is about 5520.4819535979. The cubic root of 30475721 is about 312.3570623102.

The spelling of 30475721 in words is "thirty million, four hundred seventy-five thousand, seven hundred twenty-one".