161317751 has 24 divisors (see below), whose sum is σ = 192805920. Its totient is φ = 134534400.

The previous prime is 161317687. The next prime is 161317757. The reversal of 161317751 is 157713161.

It is not a de Polignac number, because 161317751 - 2⁶ = 161317687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161317757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309371 + ... + 309891.

It is an arithmetic number, because the mean of its divisors is an integer number (8033580).

Almost surely, 2^161317751 is an apocalyptic number.

161317751 is a deficient number, since it is larger than the sum of its proper divisors (31488169).

161317751 is an equidigital number, since it uses as much as digits as its factorization.

161317751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 688 counting only the distinct ones).

The product of its digits is 4410, while the sum is 32.

The square root of 161317751 is about 12701.0925120637. The cubic root of 161317751 is about 544.3698364130.

The spelling of 161317751 in words is "one hundred sixty-one million, three hundred seventeen thousand, seven hundred fifty-one".