165088621 has 2 divisors, whose sum is σ = 165088622. Its totient is φ = 165088620.

The previous prime is 165088607. The next prime is 165088639. The reversal of 165088621 is 126880561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149572900 + 15515721 = 12230^2 + 3939^2 .

It is an emirp because it is prime and its reverse (126880561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165088621 - 2⁵ = 165088589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165088601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82544310 + 82544311.

It is an arithmetic number, because the mean of its divisors is an integer number (82544311).

Almost surely, 2^165088621 is an apocalyptic number.

It is an amenable number.

165088621 is a deficient number, since it is larger than the sum of its proper divisors (1).

165088621 is an equidigital number, since it uses as much as digits as its factorization.

165088621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 165088621 is about 12848.6816833479. The cubic root of 165088621 is about 548.5788334342.

The spelling of 165088621 in words is "one hundred sixty-five million, eighty-eight thousand, six hundred twenty-one".