161262172 has 6 divisors (see below), whose sum is σ = 282208808. Its totient is φ = 80631084.

The previous prime is 161262109. The next prime is 161262191. The reversal of 161262172 is 271262161.

161262172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161262172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20157768 + ... + 20157775.

Almost surely, 2^161262172 is an apocalyptic number.

It is an amenable number.

161262172 is a deficient number, since it is larger than the sum of its proper divisors (120946636).

161262172 is a wasteful number, since it uses less digits than its factorization.

161262172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40315547 (or 40315545 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 161262172 is about 12698.9043621881. The cubic root of 161262172 is about 544.3073117657.

The spelling of 161262172 in words is "one hundred sixty-one million, two hundred sixty-two thousand, one hundred seventy-two".