161540154 has 24 divisors (see below), whose sum is σ = 370592820. Its totient is φ = 50679168.

The previous prime is 161540129. The next prime is 161540189. The reversal of 161540154 is 451045161.

161540154 is a `hidden beast` number, since 1 + 615 + 40 + 1 + 5 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 154330929 + 7209225 = 12423^2 + 2685^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263649 + ... + 264260.

Almost surely, 2^161540154 is an apocalyptic number.

161540154 is an abundant number, since it is smaller than the sum of its proper divisors (209052666).

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

161540154 is a wasteful number, since it uses less digits than its factorization.

161540154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527934 (or 527931 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 161540154 is about 12709.8447669513. The cubic root of 161540154 is about 544.6198892611.

The spelling of 161540154 in words is "one hundred sixty-one million, five hundred forty thousand, one hundred fifty-four".