15139231 has 4 divisors (see below), whose sum is σ = 16029792. Its totient is φ = 14248672.

The previous prime is 15139177. The next prime is 15139237. The reversal of 15139231 is 13293151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13293151 = 47 ⋅282833.

It is a cyclic number.

It is not a de Polignac number, because 15139231 - 2⁹ = 15138719 is a prime.

It is a super-2 number, since 2×15139231² = 458392630542722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 15139196 and 15139205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15139237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445255 + ... + 445288.

It is an arithmetic number, because the mean of its divisors is an integer number (4007448).

Almost surely, 2^15139231 is an apocalyptic number.

15139231 is a deficient number, since it is larger than the sum of its proper divisors (890561).

15139231 is an equidigital number, since it uses as much as digits as its factorization.

15139231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890560.

The product of its digits is 810, while the sum is 25.

The square root of 15139231 is about 3890.9164730176. The cubic root of 15139231 is about 247.3819101307.

The spelling of 15139231 in words is "fifteen million, one hundred thirty-nine thousand, two hundred thirty-one".