161311144 has 48 divisors (see below), whose sum is σ = 323305920. Its totient is φ = 75414240.

The previous prime is 161311069. The next prime is 161311169. The reversal of 161311144 is 441113161.

It is a happy number.

161311144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198499 + ... + 199309.

It is an arithmetic number, because the mean of its divisors is an integer number (6735540).

Almost surely, 2^161311144 is an apocalyptic number.

It is an amenable number.

161311144 is an abundant number, since it is smaller than the sum of its proper divisors (161994776).

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

161311144 is a wasteful number, since it uses less digits than its factorization.

161311144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 883 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 161311144 is about 12700.8324136649. The cubic root of 161311144 is about 544.3624044956.

The spelling of 161311144 in words is "one hundred sixty-one million, three hundred eleven thousand, one hundred forty-four".