161139854 has 4 divisors (see below), whose sum is σ = 241709784. Its totient is φ = 80569926.

The previous prime is 161139841. The next prime is 161139859. The reversal of 161139854 is 458931161.

161139854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161139859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40284962 + ... + 40284965.

It is an arithmetic number, because the mean of its divisors is an integer number (60427446).

Almost surely, 2^161139854 is an apocalyptic number.

161139854 is a deficient number, since it is larger than the sum of its proper divisors (80569930).

161139854 is an equidigital number, since it uses as much as digits as its factorization.

161139854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80569929.

The product of its digits is 25920, while the sum is 38.

The square root of 161139854 is about 12694.0873638084. The cubic root of 161139854 is about 544.1696572010.

The spelling of 161139854 in words is "one hundred sixty-one million, one hundred thirty-nine thousand, eight hundred fifty-four".