165023149 has 2 divisors, whose sum is σ = 165023150. Its totient is φ = 165023148.

The previous prime is 165023141. The next prime is 165023153. The reversal of 165023149 is 941320561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149891049 + 15132100 = 12243^2 + 3890^2 .

It is a cyclic number.

It is not a de Polignac number, because 165023149 - 2³ = 165023141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165023149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165023141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82511574 + 82511575.

It is an arithmetic number, because the mean of its divisors is an integer number (82511575).

Almost surely, 2^165023149 is an apocalyptic number.

It is an amenable number.

165023149 is a deficient number, since it is larger than the sum of its proper divisors (1).

165023149 is an equidigital number, since it uses as much as digits as its factorization.

165023149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 165023149 is about 12846.1336206658. The cubic root of 165023149 is about 548.5063041018.

The spelling of 165023149 in words is "one hundred sixty-five million, twenty-three thousand, one hundred forty-nine".