161131544 has 16 divisors (see below), whose sum is σ = 345282000. Its totient is φ = 69056352.

The previous prime is 161131543. The next prime is 161131567. The reversal of 161131544 is 445131161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161131543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438619 + ... + 1438730.

It is an arithmetic number, because the mean of its divisors is an integer number (21580125).

Almost surely, 2^161131544 is an apocalyptic number.

161131544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161131544 is an abundant number, since it is smaller than the sum of its proper divisors (184150456).

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

161131544 is a wasteful number, since it uses less digits than its factorization.

161131544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2877362 (or 2877358 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 161131544 is about 12693.7600418473. The cubic root of 161131544 is about 544.1603027439.

The spelling of 161131544 in words is "one hundred sixty-one million, one hundred thirty-one thousand, five hundred forty-four".