161131641 has 8 divisors (see below), whose sum is σ = 234373344. Its totient is φ = 97655520.

The previous prime is 161131603. The next prime is 161131643. The reversal of 161131641 is 146131161.

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

It is not a de Polignac number, because 161131641 - 2⁹ = 161131129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161131643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2441356 + ... + 2441421.

It is an arithmetic number, because the mean of its divisors is an integer number (29296668).

Almost surely, 2^161131641 is an apocalyptic number.

161131641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161131641 is a deficient number, since it is larger than the sum of its proper divisors (73241703).

161131641 is a wasteful number, since it uses less digits than its factorization.

161131641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4882791.

The product of its digits is 432, while the sum is 24.

The square root of 161131641 is about 12693.7638626217. The cubic root of 161131641 is about 544.1604119373.

The spelling of 161131641 in words is "one hundred sixty-one million, one hundred thirty-one thousand, six hundred forty-one".