30622721 has 2 divisors, whose sum is σ = 30622722. Its totient is φ = 30622720.

The previous prime is 30622687. The next prime is 30622727. The reversal of 30622721 is 12722603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 8202496 = 4735^2 + 2864^2 .

It is an emirp because it is prime and its reverse (12722603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30622721 - 2²² = 26428417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30622727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15311360 + 15311361.

It is an arithmetic number, because the mean of its divisors is an integer number (15311361).

Almost surely, 2^30622721 is an apocalyptic number.

It is an amenable number.

30622721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30622721 is an equidigital number, since it uses as much as digits as its factorization.

30622721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 30622721 is about 5533.7799920127. The cubic root of 30622721 is about 312.8584763059.

The spelling of 30622721 in words is "thirty million, six hundred twenty-two thousand, seven hundred twenty-one".