16121187 has 20 divisors (see below), whose sum is σ = 24916320. Its totient is φ = 10375344.

The previous prime is 16121179. The next prime is 16121191. The reversal of 16121187 is 78112161.

It is not a de Polignac number, because 16121187 - 2³ = 16121179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 16121187.

It is not an unprimeable number, because it can be changed into a prime (16121107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1083 + ... + 5780.

It is an arithmetic number, because the mean of its divisors is an integer number (1245816).

Almost surely, 2^16121187 is an apocalyptic number.

16121187 is a deficient number, since it is larger than the sum of its proper divisors (8795133).

16121187 is an equidigital number, since it uses as much as digits as its factorization.

16121187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904 (or 6895 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 16121187 is about 4015.1197989599. The cubic root of 16121187 is about 252.6188023761.

The spelling of 16121187 in words is "sixteen million, one hundred twenty-one thousand, one hundred eighty-seven".