165315431 has 2 divisors, whose sum is σ = 165315432. Its totient is φ = 165315430.

The previous prime is 165315401. The next prime is 165315433. The reversal of 165315431 is 134513561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165315431 - 2¹⁰ = 165314407 is a prime.

It is a super-2 number, since 2×165315431² = 54658383453431522, which contains 22 as substring.

Together with 165315433, 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 = 165315394 and 165315403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165315433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82657715 + 82657716.

It is an arithmetic number, because the mean of its divisors is an integer number (82657716).

Almost surely, 2^165315431 is an apocalyptic number.

165315431 is a deficient number, since it is larger than the sum of its proper divisors (1).

165315431 is an equidigital number, since it uses as much as digits as its factorization.

165315431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 29.

The square root of 165315431 is about 12857.5048512532. The cubic root of 165315431 is about 548.8299434695.

Adding to 165315431 its reverse (134513561), we get a palindrome (299828992).

The spelling of 165315431 in words is "one hundred sixty-five million, three hundred fifteen thousand, four hundred thirty-one".