15421139 has 2 divisors, whose sum is σ = 15421140. Its totient is φ = 15421138.

The previous prime is 15421121. The next prime is 15421163. The reversal of 15421139 is 93112451.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15421139 is a prime.

It is not a weakly prime, because it can be changed into another prime (15421199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710569 + 7710570.

It is an arithmetic number, because the mean of its divisors is an integer number (7710570).

Almost surely, 2^15421139 is an apocalyptic number.

15421139 is a deficient number, since it is larger than the sum of its proper divisors (1).

15421139 is an equidigital number, since it uses as much as digits as its factorization.

15421139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 15421139 is about 3926.9758084307. The cubic root of 15421139 is about 248.9079782325.

The spelling of 15421139 in words is "fifteen million, four hundred twenty-one thousand, one hundred thirty-nine".