521875197401 has 2 divisors, whose sum is σ = 521875197402. Its totient is φ = 521875197400.

The previous prime is 521875197359. The next prime is 521875197419. The reversal of 521875197401 is 104791578125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314143435225 + 207731762176 = 560485^2 + 455776^2 .

It is a cyclic number.

It is not a de Polignac number, because 521875197401 - 2³⁸ = 246997290457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 521875197401.

It is not a weakly prime, because it can be changed into another prime (521875197461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260937598700 + 260937598701.

It is an arithmetic number, because the mean of its divisors is an integer number (260937598701).

Almost surely, 2^521875197401 is an apocalyptic number.

It is an amenable number.

521875197401 is a deficient number, since it is larger than the sum of its proper divisors (1).

521875197401 is an equidigital number, since it uses as much as digits as its factorization.

521875197401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 50.

The spelling of 521875197401 in words is "five hundred twenty-one billion, eight hundred seventy-five million, one hundred ninety-seven thousand, four hundred one".