165192491 has 2 divisors, whose sum is σ = 165192492. Its totient is φ = 165192490.

The previous prime is 165192449. The next prime is 165192499. The reversal of 165192491 is 194291561.

165192491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165192491 - 2⁶ = 165192427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (165192499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82596245 + 82596246.

It is an arithmetic number, because the mean of its divisors is an integer number (82596246).

Almost surely, 2^165192491 is an apocalyptic number.

165192491 is a deficient number, since it is larger than the sum of its proper divisors (1).

165192491 is an equidigital number, since it uses as much as digits as its factorization.

165192491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 38.

The square root of 165192491 is about 12852.7230966827. The cubic root of 165192491 is about 548.6938604157.

The spelling of 165192491 in words is "one hundred sixty-five million, one hundred ninety-two thousand, four hundred ninety-one".