521201393 has 2 divisors, whose sum is σ = 521201394. Its totient is φ = 521201392.

The previous prime is 521201363. The next prime is 521201399. The reversal of 521201393 is 393102125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302516449 + 218684944 = 17393^2 + 14788^2 .

It is a cyclic number.

It is not a de Polignac number, because 521201393 - 2¹⁴ = 521185009 is a prime.

It is not a weakly prime, because it can be changed into another prime (521201399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260600696 + 260600697.

It is an arithmetic number, because the mean of its divisors is an integer number (260600697).

Almost surely, 2^521201393 is an apocalyptic number.

It is an amenable number.

521201393 is a deficient number, since it is larger than the sum of its proper divisors (1).

521201393 is an equidigital number, since it uses as much as digits as its factorization.

521201393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 521201393 is about 22829.8355885451. The cubic root of 521201393 is about 804.7639666522.

The spelling of 521201393 in words is "five hundred twenty-one million, two hundred one thousand, three hundred ninety-three".