161317757 has 2 divisors, whose sum is σ = 161317758. Its totient is φ = 161317756.

The previous prime is 161317687. The next prime is 161317789. The reversal of 161317757 is 757713161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160934596 + 383161 = 12686^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 161317757 - 2⁸ = 161317501 is a prime.

It is a super-2 number, since 2×161317757² = 52046837447022098, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161317757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161397757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80658878 + 80658879.

It is an arithmetic number, because the mean of its divisors is an integer number (80658879).

Almost surely, 2^161317757 is an apocalyptic number.

It is an amenable number.

161317757 is a deficient number, since it is larger than the sum of its proper divisors (1).

161317757 is an equidigital number, since it uses as much as digits as its factorization.

161317757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30870, while the sum is 38.

The square root of 161317757 is about 12701.0927482638. The cubic root of 161317757 is about 544.3698431620.

The spelling of 161317757 in words is "one hundred sixty-one million, three hundred seventeen thousand, seven hundred fifty-seven".