161261188 has 24 divisors (see below), whose sum is σ = 321249600. Its totient is φ = 70113120.

The previous prime is 161261179. The next prime is 161261197. The reversal of 161261188 is 881162161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161261179) and next prime (161261197).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78663 + ... + 80686.

It is an arithmetic number, because the mean of its divisors is an integer number (13385400).

Almost surely, 2^161261188 is an apocalyptic number.

It is an amenable number.

161261188 is a deficient number, since it is larger than the sum of its proper divisors (159988412).

161261188 is a wasteful number, since it uses less digits than its factorization.

161261188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159387 (or 159385 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 161261188 is about 12698.8656186291. The cubic root of 161261188 is about 544.3062046668.

The spelling of 161261188 in words is "one hundred sixty-one million, two hundred sixty-one thousand, one hundred eighty-eight".