165131749 has 2 divisors, whose sum is σ = 165131750. Its totient is φ = 165131748.

The previous prime is 165131741. The next prime is 165131773. The reversal of 165131749 is 947131561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162180225 + 2951524 = 12735^2 + 1718^2 .

It is a cyclic number.

It is not a de Polignac number, because 165131749 - 2³ = 165131741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165131741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82565874 + 82565875.

It is an arithmetic number, because the mean of its divisors is an integer number (82565875).

Almost surely, 2^165131749 is an apocalyptic number.

It is an amenable number.

165131749 is a deficient number, since it is larger than the sum of its proper divisors (1).

165131749 is an equidigital number, since it uses as much as digits as its factorization.

165131749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 165131749 is about 12850.3598782291. The cubic root of 165131749 is about 548.6265997952.

The spelling of 165131749 in words is "one hundred sixty-five million, one hundred thirty-one thousand, seven hundred forty-nine".