161259987 has 16 divisors (see below), whose sum is σ = 246444800. Its totient is φ = 91880352.

The previous prime is 161259983. The next prime is 161260009. The reversal of 161259987 is 789952161.

161259987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161259987 - 2² = 161259983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161259983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3673 + ... + 18330.

It is an arithmetic number, because the mean of its divisors is an integer number (15402800).

Almost surely, 2^161259987 is an apocalyptic number.

161259987 is a deficient number, since it is larger than the sum of its proper divisors (85184813).

161259987 is a wasteful number, since it uses less digits than its factorization.

161259987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22362.

The product of its digits is 272160, while the sum is 48.

The square root of 161259987 is about 12698.8183308527. The cubic root of 161259987 is about 544.3048534151.

The spelling of 161259987 in words is "one hundred sixty-one million, two hundred fifty-nine thousand, nine hundred eighty-seven".