161831455 has 16 divisors (see below), whose sum is σ = 211471200. Its totient is φ = 118419840.

The previous prime is 161831443. The next prime is 161831477. The reversal of 161831455 is 554138161.

It is not a de Polignac number, because 161831455 - 2¹⁵ = 161798687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161831455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26616 + ... + 32125.

It is an arithmetic number, because the mean of its divisors is an integer number (13216950).

Almost surely, 2^161831455 is an apocalyptic number.

161831455 is a deficient number, since it is larger than the sum of its proper divisors (49639745).

161831455 is a wasteful number, since it uses less digits than its factorization.

161831455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58794.

The product of its digits is 14400, while the sum is 34.

The square root of 161831455 is about 12721.2992654052. The cubic root of 161831455 is about 544.9470587971.

The spelling of 161831455 in words is "one hundred sixty-one million, eight hundred thirty-one thousand, four hundred fifty-five".