521373631237 has 2 divisors, whose sum is σ = 521373631238. Its totient is φ = 521373631236.

The previous prime is 521373631231. The next prime is 521373631309. The reversal of 521373631237 is 732136373125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354779861956 + 166593769281 = 595634^2 + 408159^2 .

It is a cyclic number.

It is not a de Polignac number, because 521373631237 - 2²⁷ = 521239413509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521373631193 and 521373631202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521373631231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260686815618 + 260686815619.

It is an arithmetic number, because the mean of its divisors is an integer number (260686815619).

Almost surely, 2^521373631237 is an apocalyptic number.

It is an amenable number.

521373631237 is a deficient number, since it is larger than the sum of its proper divisors (1).

521373631237 is an equidigital number, since it uses as much as digits as its factorization.

521373631237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 43.

The spelling of 521373631237 in words is "five hundred twenty-one billion, three hundred seventy-three million, six hundred thirty-one thousand, two hundred thirty-seven".