161971154 has 8 divisors (see below), whose sum is σ = 243537840. Its totient is φ = 80791876.

The previous prime is 161971141. The next prime is 161971213. The reversal of 161971154 is 451179161.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95804 + ... + 97479.

It is an arithmetic number, because the mean of its divisors is an integer number (30442230).

Almost surely, 2^161971154 is an apocalyptic number.

161971154 is a deficient number, since it is larger than the sum of its proper divisors (81566686).

161971154 is a wasteful number, since it uses less digits than its factorization.

161971154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193704.

The product of its digits is 7560, while the sum is 35.

The square root of 161971154 is about 12726.7888330089. The cubic root of 161971154 is about 545.1038199657.

The spelling of 161971154 in words is "one hundred sixty-one million, nine hundred seventy-one thousand, one hundred fifty-four".