520431997 has 2 divisors, whose sum is σ = 520431998. Its totient is φ = 520431996.

The previous prime is 520431991. The next prime is 520432001. The reversal of 520431997 is 799134025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451392516 + 69039481 = 21246^2 + 8309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520431997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520431991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260215998 + 260215999.

It is an arithmetic number, because the mean of its divisors is an integer number (260215999).

Almost surely, 2^520431997 is an apocalyptic number.

It is an amenable number.

520431997 is a deficient number, since it is larger than the sum of its proper divisors (1).

520431997 is an equidigital number, since it uses as much as digits as its factorization.

520431997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 520431997 is about 22812.9786963474. The cubic root of 520431997 is about 804.3677748834.

The spelling of 520431997 in words is "five hundred twenty million, four hundred thirty-one thousand, nine hundred ninety-seven".