165600131 has 2 divisors, whose sum is σ = 165600132. Its totient is φ = 165600130.

The previous prime is 165600101. The next prime is 165600133. The reversal of 165600131 is 131006561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165600131 - 2¹⁸ = 165337987 is a prime.

It is a super-2 number, since 2×165600131² = 54846806774434322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 165600133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165600097 and 165600106.

It is not a weakly prime, because it can be changed into another prime (165600133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82800065 + 82800066.

It is an arithmetic number, because the mean of its divisors is an integer number (82800066).

Almost surely, 2^165600131 is an apocalyptic number.

165600131 is a deficient number, since it is larger than the sum of its proper divisors (1).

165600131 is an equidigital number, since it uses as much as digits as its factorization.

165600131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 165600131 is about 12868.5714436374. The cubic root of 165600131 is about 549.1448208580.

Adding to 165600131 its reverse (131006561), we get a palindrome (296606692).

The spelling of 165600131 in words is "one hundred sixty-five million, six hundred thousand, one hundred thirty-one".