161854090 has 16 divisors (see below), whose sum is σ = 291755520. Its totient is φ = 64648720.

The previous prime is 161854061. The next prime is 161854109. The reversal of 161854090 is 90458161.

It is an unprimeable number.

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, 4066 + ... + 18445.

It is an arithmetic number, because the mean of its divisors is an integer number (18234720).

Almost surely, 2^161854090 is an apocalyptic number.

161854090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161854090 is a deficient number, since it is larger than the sum of its proper divisors (129901430).

161854090 is a wasteful number, since it uses less digits than its factorization.

161854090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23237.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 161854090 is about 12722.1888839932. The cubic root of 161854090 is about 544.9724644506.

The spelling of 161854090 in words is "one hundred sixty-one million, eight hundred fifty-four thousand, ninety".