161854091 has 8 divisors (see below), whose sum is σ = 185854464. Its totient is φ = 138073320.

The previous prime is 161854061. The next prime is 161854109. The reversal of 161854091 is 190458161.

161854091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-161854091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161854061) 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, 53315 + ... + 56268.

It is an arithmetic number, because the mean of its divisors is an integer number (23231808).

Almost surely, 2^161854091 is an apocalyptic number.

161854091 is a deficient number, since it is larger than the sum of its proper divisors (24000373).

161854091 is a wasteful number, since it uses less digits than its factorization.

161854091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109801.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 161854091 is about 12722.1889232946. The cubic root of 161854091 is about 544.9724655730.

The spelling of 161854091 in words is "one hundred sixty-one million, eight hundred fifty-four thousand, ninety-one".