656513131 has 2 divisors, whose sum is σ = 656513132. Its totient is φ = 656513130.

The previous prime is 656513129. The next prime is 656513167. The reversal of 656513131 is 131315656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656513131 - 2¹ = 656513129 is a prime.

It is a super-2 number, since 2×656513131² = 862018982350846322, which contains 22 as substring.

Together with 656513129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 656513093 and 656513102.

It is not a weakly prime, because it can be changed into another prime (656513111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328256565 + 328256566.

It is an arithmetic number, because the mean of its divisors is an integer number (328256566).

Almost surely, 2^656513131 is an apocalyptic number.

656513131 is a deficient number, since it is larger than the sum of its proper divisors (1).

656513131 is an equidigital number, since it uses as much as digits as its factorization.

656513131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 31.

The square root of 656513131 is about 25622.5121914304. The cubic root of 656513131 is about 869.1227917801.

Adding to 656513131 its reverse (131315656), we get a palindrome (787828787).

It can be divided in two parts, 6565 and 13131, that multiplied together give a triangular number (86205015 = T₁₃₁₃₀).

The spelling of 656513131 in words is "six hundred fifty-six million, five hundred thirteen thousand, one hundred thirty-one".