16276721 has 2 divisors, whose sum is σ = 16276722. Its totient is φ = 16276720.

The previous prime is 16276717. The next prime is 16276727. The reversal of 16276721 is 12767261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 2131600 = 3761^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 16276721 - 2² = 16276717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16276727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8138360 + 8138361.

It is an arithmetic number, because the mean of its divisors is an integer number (8138361).

Almost surely, 2^16276721 is an apocalyptic number.

It is an amenable number.

16276721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16276721 is an equidigital number, since it uses as much as digits as its factorization.

16276721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 16276721 is about 4034.4418449149. The cubic root of 16276721 is about 253.4286089388.

The spelling of 16276721 in words is "sixteen million, two hundred seventy-six thousand, seven hundred twenty-one".