520135531031 has 2 divisors, whose sum is σ = 520135531032. Its totient is φ = 520135531030.

The previous prime is 520135531001. The next prime is 520135531037. The reversal of 520135531031 is 130135531025.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520135531031 is a prime.

It is a super-2 number, since 2×520135531031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 520135530985 and 520135531003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520135531037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260067765515 + 260067765516.

It is an arithmetic number, because the mean of its divisors is an integer number (260067765516).

Almost surely, 2^520135531031 is an apocalyptic number.

520135531031 is a deficient number, since it is larger than the sum of its proper divisors (1).

520135531031 is an equidigital number, since it uses as much as digits as its factorization.

520135531031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 29.

The spelling of 520135531031 in words is "five hundred twenty billion, one hundred thirty-five million, five hundred thirty-one thousand, thirty-one".