161813759 has 2 divisors, whose sum is σ = 161813760. Its totient is φ = 161813758.

The previous prime is 161813737. The next prime is 161813761. The reversal of 161813759 is 957318161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161813759 - 2⁸ = 161813503 is a prime.

Together with 161813761, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161813789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80906879 + 80906880.

It is an arithmetic number, because the mean of its divisors is an integer number (80906880).

Almost surely, 2^161813759 is an apocalyptic number.

161813759 is a deficient number, since it is larger than the sum of its proper divisors (1).

161813759 is an equidigital number, since it uses as much as digits as its factorization.

161813759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 161813759 is about 12720.6037199498. The cubic root of 161813759 is about 544.9271950554.

The spelling of 161813759 in words is "one hundred sixty-one million, eight hundred thirteen thousand, seven hundred fifty-nine".