165206131 has 2 divisors, whose sum is σ = 165206132. Its totient is φ = 165206130.

The previous prime is 165206101. The next prime is 165206183. The reversal of 165206131 is 131602561.

It is a weak prime.

It is an emirp because it is prime and its reverse (131602561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165206131 - 2²³ = 156817523 is a prime.

It is a super-2 number, since 2×165206131² = 54586131439978322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165206096 and 165206105.

It is not a weakly prime, because it can be changed into another prime (165206101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82603065 + 82603066.

It is an arithmetic number, because the mean of its divisors is an integer number (82603066).

Almost surely, 2^165206131 is an apocalyptic number.

165206131 is a deficient number, since it is larger than the sum of its proper divisors (1).

165206131 is an equidigital number, since it uses as much as digits as its factorization.

165206131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 165206131 is about 12853.2537125819. The cubic root of 165206131 is about 548.7089619461.

Adding to 165206131 its reverse (131602561), we get a palindrome (296808692).

The spelling of 165206131 in words is "one hundred sixty-five million, two hundred six thousand, one hundred thirty-one".