16161987 has 4 divisors (see below), whose sum is σ = 21549320. Its totient is φ = 10774656.

The previous prime is 16161953. The next prime is 16161991. The reversal of 16161987 is 78916161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16161987 - 2⁶ = 16161923 is a prime.

It is a super-2 number, since 2×16161987² = 522419647576338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16161907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2693662 + ... + 2693667.

It is an arithmetic number, because the mean of its divisors is an integer number (5387330).

Almost surely, 2^16161987 is an apocalyptic number.

16161987 is a deficient number, since it is larger than the sum of its proper divisors (5387333).

16161987 is an equidigital number, since it uses as much as digits as its factorization.

16161987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387332.

The product of its digits is 18144, while the sum is 39.

The square root of 16161987 is about 4020.1973832139. The cubic root of 16161987 is about 252.8317346781.

The spelling of 16161987 in words is "sixteen million, one hundred sixty-one thousand, nine hundred eighty-seven".