161987154 has 16 divisors (see below), whose sum is σ = 370256448. Its totient is φ = 46282032.

The previous prime is 161987131. The next prime is 161987159. The reversal of 161987154 is 451789161.

161987154 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161987154² = 52479676122039432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 3856837 = 161987154 / (1 + 6 + 1 + 9 + 8 + 7 + 1 + 5 + 4).

It is not an unprimeable number, because it can be changed into a prime (161987159) 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, 1928377 + ... + 1928460.

It is an arithmetic number, because the mean of its divisors is an integer number (23141028).

Almost surely, 2^161987154 is an apocalyptic number.

161987154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161987154 is an abundant number, since it is smaller than the sum of its proper divisors (208269294).

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

161987154 is a wasteful number, since it uses less digits than its factorization.

161987154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856849.

The product of its digits is 60480, while the sum is 42.

The square root of 161987154 is about 12727.4174128140. The cubic root of 161987154 is about 545.1217683755.

The spelling of 161987154 in words is "one hundred sixty-one million, nine hundred eighty-seven thousand, one hundred fifty-four".