161277894 has 48 divisors (see below), whose sum is σ = 362224512. Its totient is φ = 51819264.

The previous prime is 161277889. The next prime is 161277901. The reversal of 161277894 is 498772161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74187 + ... + 76329.

It is an arithmetic number, because the mean of its divisors is an integer number (7546344).

Almost surely, 2^161277894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161277894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181112256).

161277894 is an abundant number, since it is smaller than the sum of its proper divisors (200946618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161277894 is a wasteful number, since it uses less digits than its factorization.

161277894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301 (or 2298 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 161277894 is about 12699.5233768831. The cubic root of 161277894 is about 544.3249999839.

The spelling of 161277894 in words is "one hundred sixty-one million, two hundred seventy-seven thousand, eight hundred ninety-four".