52650721 has 2 divisors, whose sum is σ = 52650722. Its totient is φ = 52650720.

The previous prime is 52650713. The next prime is 52650757. The reversal of 52650721 is 12705625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44036496 + 8614225 = 6636^2 + 2935^2 .

It is a cyclic number.

It is not a de Polignac number, because 52650721 - 2³ = 52650713 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52650721.

It is not a weakly prime, because it can be changed into another prime (52650701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26325360 + 26325361.

It is an arithmetic number, because the mean of its divisors is an integer number (26325361).

Almost surely, 2^52650721 is an apocalyptic number.

It is an amenable number.

52650721 is a deficient number, since it is larger than the sum of its proper divisors (1).

52650721 is an equidigital number, since it uses as much as digits as its factorization.

52650721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 52650721 is about 7256.0816561006. The cubic root of 52650721 is about 374.8016040931.

The spelling of 52650721 in words is "fifty-two million, six hundred fifty thousand, seven hundred twenty-one".