521397629 has 2 divisors, whose sum is σ = 521397630. Its totient is φ = 521397628.

The previous prime is 521397593. The next prime is 521397631. The reversal of 521397629 is 926793125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 503104900 + 18292729 = 22430^2 + 4277^2 .

It is a cyclic number.

It is not a de Polignac number, because 521397629 - 2¹⁶ = 521332093 is a prime.

Together with 521397631, it forms a pair of twin primes.

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 521397629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521397329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260698814 + 260698815.

It is an arithmetic number, because the mean of its divisors is an integer number (260698815).

Almost surely, 2^521397629 is an apocalyptic number.

It is an amenable number.

521397629 is a deficient number, since it is larger than the sum of its proper divisors (1).

521397629 is an equidigital number, since it uses as much as digits as its factorization.

521397629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 521397629 is about 22834.1329811316. The cubic root of 521397629 is about 804.8649537487.

The spelling of 521397629 in words is "five hundred twenty-one million, three hundred ninety-seven thousand, six hundred twenty-nine".