161597154 has 32 divisors (see below), whose sum is σ = 332841600. Its totient is φ = 52272000.

The previous prime is 161597143. The next prime is 161597197. The reversal of 161597154 is 451795161.

It is a super-2 number, since 2×161597154² = 52227280361799432, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 47304 + ... + 50604.

It is an arithmetic number, because the mean of its divisors is an integer number (10401300).

Almost surely, 2^161597154 is an apocalyptic number.

161597154 is an abundant number, since it is smaller than the sum of its proper divisors (171244446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161597154 is a wasteful number, since it uses less digits than its factorization.

161597154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3546.

The product of its digits is 37800, while the sum is 39.

The square root of 161597154 is about 12712.0869254423. The cubic root of 161597154 is about 544.6839387298.

The spelling of 161597154 in words is "one hundred sixty-one million, five hundred ninety-seven thousand, one hundred fifty-four".