161072231 has 12 divisors (see below), whose sum is σ = 167842080. Its totient is φ = 154458720.

The previous prime is 161072209. The next prime is 161072239. The reversal of 161072231 is 132270161.

161072231 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 161072231 - 2⁶ = 161072167 is a prime.

It is a super-2 number, since 2×161072231² = 51888527198634722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161072197 and 161072206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161072239) 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, 722186 + ... + 722408.

It is an arithmetic number, because the mean of its divisors is an integer number (13986840).

Almost surely, 2^161072231 is an apocalyptic number.

161072231 is a deficient number, since it is larger than the sum of its proper divisors (6769849).

161072231 is an frugal number, since it uses more digits than its factorization.

161072231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 161072231 is about 12691.4235214179. The cubic root of 161072231 is about 544.0935255416.

The spelling of 161072231 in words is "one hundred sixty-one million, seventy-two thousand, two hundred thirty-one".