16515139 has 8 divisors (see below), whose sum is σ = 16980480. Its totient is φ = 16053576.

The previous prime is 16515137. The next prime is 16515193. The reversal of 16515139 is 93151561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16515139 - 2¹ = 16515137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16515139.

It is not an unprimeable number, because it can be changed into a prime (16515133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9474 + ... + 11080.

It is an arithmetic number, because the mean of its divisors is an integer number (2122560).

Almost surely, 2^16515139 is an apocalyptic number.

16515139 is a deficient number, since it is larger than the sum of its proper divisors (465341).

16515139 is a wasteful number, since it uses less digits than its factorization.

16515139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889.

The product of its digits is 4050, while the sum is 31.

The square root of 16515139 is about 4063.8822571526. The cubic root of 16515139 is about 254.6600056812.

The spelling of 16515139 in words is "sixteen million, five hundred fifteen thousand, one hundred thirty-nine".