161131841 has 8 divisors (see below), whose sum is σ = 175316904. Its totient is φ = 147202560.

The previous prime is 161131829. The next prime is 161131843. The reversal of 161131841 is 148131161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 577600 + 160554241 = 760^2 + 12671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161131841 - 2⁶ = 161131777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161131841.

It is not an unprimeable number, because it can be changed into a prime (161131843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62630 + ... + 65151.

It is an arithmetic number, because the mean of its divisors is an integer number (21914613).

Almost surely, 2^161131841 is an apocalyptic number.

It is an amenable number.

161131841 is a deficient number, since it is larger than the sum of its proper divisors (14185063).

161131841 is a wasteful number, since it uses less digits than its factorization.

161131841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127891.

The product of its digits is 576, while the sum is 26.

The square root of 161131841 is about 12693.7717405033. The cubic root of 161131841 is about 544.1606370784.

The spelling of 161131841 in words is "one hundred sixty-one million, one hundred thirty-one thousand, eight hundred forty-one".