521736401 has 2 divisors, whose sum is σ = 521736402. Its totient is φ = 521736400.

The previous prime is 521736389. The next prime is 521736427. The reversal of 521736401 is 104637125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511845376 + 9891025 = 22624^2 + 3145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521736401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521736101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260868200 + 260868201.

It is an arithmetic number, because the mean of its divisors is an integer number (260868201).

Almost surely, 2^521736401 is an apocalyptic number.

It is an amenable number.

521736401 is a deficient number, since it is larger than the sum of its proper divisors (1).

521736401 is an equidigital number, since it uses as much as digits as its factorization.

521736401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 521736401 is about 22841.5498817396. The cubic root of 521736401 is about 805.0392331997.

The spelling of 521736401 in words is "five hundred twenty-one million, seven hundred thirty-six thousand, four hundred one".