165949501 has 2 divisors, whose sum is σ = 165949502. Its totient is φ = 165949500.

The previous prime is 165949499. The next prime is 165949517. The reversal of 165949501 is 105949561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155875225 + 10074276 = 12485^2 + 3174^2 .

It is a cyclic number.

It is not a de Polignac number, because 165949501 - 2¹ = 165949499 is a prime.

Together with 165949499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165949561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82974750 + 82974751.

It is an arithmetic number, because the mean of its divisors is an integer number (82974751).

Almost surely, 2^165949501 is an apocalyptic number.

It is an amenable number.

165949501 is a deficient number, since it is larger than the sum of its proper divisors (1).

165949501 is an equidigital number, since it uses as much as digits as its factorization.

165949501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 165949501 is about 12882.1388363889. The cubic root of 165949501 is about 549.5307303032.

The spelling of 165949501 in words is "one hundred sixty-five million, nine hundred forty-nine thousand, five hundred one".