15261139 has 2 divisors, whose sum is σ = 15261140. Its totient is φ = 15261138.

The previous prime is 15261137. The next prime is 15261157. The reversal of 15261139 is 93116251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15261139 - 2¹ = 15261137 is a prime.

Together with 15261137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15261133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7630569 + 7630570.

It is an arithmetic number, because the mean of its divisors is an integer number (7630570).

Almost surely, 2^15261139 is an apocalyptic number.

15261139 is a deficient number, since it is larger than the sum of its proper divisors (1).

15261139 is an equidigital number, since it uses as much as digits as its factorization.

15261139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 28.

The square root of 15261139 is about 3906.5507804200. The cubic root of 15261139 is about 248.0441464508.

It can be divided in two parts, 15261 and 139, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 15261139 in words is "fifteen million, two hundred sixty-one thousand, one hundred thirty-nine".