161582117 has 2 divisors, whose sum is σ = 161582118. Its totient is φ = 161582116.

The previous prime is 161582101. The next prime is 161582131. The reversal of 161582117 is 711285161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106213636 + 55368481 = 10306^2 + 7441^2 .

It is a cyclic number.

It is not a de Polignac number, because 161582117 - 2⁴ = 161582101 is a prime.

It is a super-2 number, since 2×161582117² = 52217561068403378, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161582147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80791058 + 80791059.

It is an arithmetic number, because the mean of its divisors is an integer number (80791059).

Almost surely, 2^161582117 is an apocalyptic number.

It is an amenable number.

161582117 is a deficient number, since it is larger than the sum of its proper divisors (1).

161582117 is an equidigital number, since it uses as much as digits as its factorization.

161582117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 32.

The square root of 161582117 is about 12711.4954667026. The cubic root of 161582117 is about 544.6670434933.

The spelling of 161582117 in words is "one hundred sixty-one million, five hundred eighty-two thousand, one hundred seventeen".