161172117 has 12 divisors (see below), whose sum is σ = 245057280. Its totient is φ = 101792808.

The previous prime is 161172097. The next prime is 161172119. The reversal of 161172117 is 711271161.

161172117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161172117 - 2¹⁰ = 161171093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161172119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471093 + ... + 471434.

It is an arithmetic number, because the mean of its divisors is an integer number (20421440).

Almost surely, 2^161172117 is an apocalyptic number.

It is an amenable number.

161172117 is a deficient number, since it is larger than the sum of its proper divisors (83885163).

161172117 is a wasteful number, since it uses less digits than its factorization.

161172117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942552 (or 942549 counting only the distinct ones).

The product of its digits is 588, while the sum is 27.

The square root of 161172117 is about 12695.3580886874. The cubic root of 161172117 is about 544.2059721859.

The spelling of 161172117 in words is "one hundred sixty-one million, one hundred seventy-two thousand, one hundred seventeen".