165291437 has 2 divisors, whose sum is σ = 165291438. Its totient is φ = 165291436.

The previous prime is 165291407. The next prime is 165291461. The reversal of 165291437 is 734192561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161315401 + 3976036 = 12701^2 + 1994^2 .

It is a cyclic number.

It is not a de Polignac number, because 165291437 - 2²⁴ = 148514221 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165291437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165291407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82645718 + 82645719.

It is an arithmetic number, because the mean of its divisors is an integer number (82645719).

Almost surely, 2^165291437 is an apocalyptic number.

It is an amenable number.

165291437 is a deficient number, since it is larger than the sum of its proper divisors (1).

165291437 is an equidigital number, since it uses as much as digits as its factorization.

165291437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 165291437 is about 12856.5717436648. The cubic root of 165291437 is about 548.8033896612.

The spelling of 165291437 in words is "one hundred sixty-five million, two hundred ninety-one thousand, four hundred thirty-seven".