16138131 has 4 divisors (see below), whose sum is σ = 21517512. Its totient is φ = 10758752.

The previous prime is 16138097. The next prime is 16138139. The reversal of 16138131 is 13183161.

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

It is a cyclic number.

It is not a de Polignac number, because 16138131 - 2²¹ = 14040979 is a prime.

It is a super-2 number, since 2×16138131² = 520878544346322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16138139) 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, 2689686 + ... + 2689691.

It is an arithmetic number, because the mean of its divisors is an integer number (5379378).

Almost surely, 2^16138131 is an apocalyptic number.

16138131 is a deficient number, since it is larger than the sum of its proper divisors (5379381).

16138131 is an equidigital number, since it uses as much as digits as its factorization.

16138131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379380.

The product of its digits is 432, while the sum is 24.

The square root of 16138131 is about 4017.2292690361. The cubic root of 16138131 is about 252.7072754777.

The spelling of 16138131 in words is "sixteen million, one hundred thirty-eight thousand, one hundred thirty-one".