642116131 has 2 divisors, whose sum is σ = 642116132. Its totient is φ = 642116130.

The previous prime is 642116107. The next prime is 642116149. The reversal of 642116131 is 131611246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642116131 - 2⁷ = 642116003 is a prime.

It is a super-2 number, since 2×642116131² = 824626251380818322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642116096 and 642116105.

It is not a weakly prime, because it can be changed into another prime (642116161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321058065 + 321058066.

It is an arithmetic number, because the mean of its divisors is an integer number (321058066).

Almost surely, 2^642116131 is an apocalyptic number.

642116131 is a deficient number, since it is larger than the sum of its proper divisors (1).

642116131 is an equidigital number, since it uses as much as digits as its factorization.

642116131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 642116131 is about 25340.0104775038. The cubic root of 642116131 is about 862.7226365259.

Adding to 642116131 its reverse (131611246), we get a palindrome (773727377).

The spelling of 642116131 in words is "six hundred forty-two million, one hundred sixteen thousand, one hundred thirty-one".