15552139 has 4 divisors (see below), whose sum is σ = 15765256. Its totient is φ = 15339024.

The previous prime is 15552113. The next prime is 15552143. The reversal of 15552139 is 93125551.

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 15552139 - 2¹³ = 15543947 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 15552139.

It is not an unprimeable number, because it can be changed into a prime (15552109) 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, 106449 + ... + 106594.

It is an arithmetic number, because the mean of its divisors is an integer number (3941314).

Almost surely, 2^15552139 is an apocalyptic number.

15552139 is a deficient number, since it is larger than the sum of its proper divisors (213117).

15552139 is an equidigital number, since it uses as much as digits as its factorization.

15552139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213116.

The product of its digits is 6750, while the sum is 31.

The square root of 15552139 is about 3943.6200374783. The cubic root of 15552139 is about 249.6108024154.

The spelling of 15552139 in words is "fifteen million, five hundred fifty-two thousand, one hundred thirty-nine".