161717723 has 2 divisors, whose sum is σ = 161717724. Its totient is φ = 161717722.

The previous prime is 161717687. The next prime is 161717737. The reversal of 161717723 is 327717161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161717723 - 2¹² = 161713627 is a prime.

It is a Sophie Germain prime.

It is equal to p_9065384 and since 161717723 and 9065384 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (161717783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80858861 + 80858862.

It is an arithmetic number, because the mean of its divisors is an integer number (80858862).

Almost surely, 2^161717723 is an apocalyptic number.

161717723 is a deficient number, since it is larger than the sum of its proper divisors (1).

161717723 is an equidigital number, since it uses as much as digits as its factorization.

161717723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12348, while the sum is 35.

The square root of 161717723 is about 12716.8283388587. The cubic root of 161717723 is about 544.8193694808.

The spelling of 161717723 in words is "one hundred sixty-one million, seven hundred seventeen thousand, seven hundred twenty-three".