521427131 has 2 divisors, whose sum is σ = 521427132. Its totient is φ = 521427130.

The previous prime is 521427121. The next prime is 521427169. The reversal of 521427131 is 131724125.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521427131 is a prime.

It is a super-2 number, since 2×521427131² = 543772505885782322, which contains 22 as substring.

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 521427131.

It is not a weakly prime, because it can be changed into another prime (521427121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260713565 + 260713566.

It is an arithmetic number, because the mean of its divisors is an integer number (260713566).

Almost surely, 2^521427131 is an apocalyptic number.

521427131 is a deficient number, since it is larger than the sum of its proper divisors (1).

521427131 is an equidigital number, since it uses as much as digits as its factorization.

521427131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 521427131 is about 22834.7789785669. The cubic root of 521427131 is about 804.8801338957.

The spelling of 521427131 in words is "five hundred twenty-one million, four hundred twenty-seven thousand, one hundred thirty-one".