521875397 has 2 divisors, whose sum is σ = 521875398. Its totient is φ = 521875396.

The previous prime is 521875303. The next prime is 521875399. The reversal of 521875397 is 793578125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321341476 + 200533921 = 17926^2 + 14161^2 .

It is a cyclic number.

It is not a de Polignac number, because 521875397 - 2⁸ = 521875141 is a prime.

Together with 521875399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521875399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260937698 + 260937699.

It is an arithmetic number, because the mean of its divisors is an integer number (260937699).

Almost surely, 2^521875397 is an apocalyptic number.

It is an amenable number.

521875397 is a deficient number, since it is larger than the sum of its proper divisors (1).

521875397 is an equidigital number, since it uses as much as digits as its factorization.

521875397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 47.

The square root of 521875397 is about 22844.5922922691. The cubic root of 521875397 is about 805.1107171251.

The spelling of 521875397 in words is "five hundred twenty-one million, eight hundred seventy-five thousand, three hundred ninety-seven".