15278231 has 2 divisors, whose sum is σ = 15278232. Its totient is φ = 15278230.

The previous prime is 15278213. The next prime is 15278239. The reversal of 15278231 is 13287251.

Together with previous prime (15278213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15278231 - 2¹⁸ = 15016087 is a prime.

It is a super-2 number, since 2×15278231² = 466848684978722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 15278194 and 15278203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15278239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7639115 + 7639116.

It is an arithmetic number, because the mean of its divisors is an integer number (7639116).

Almost surely, 2^15278231 is an apocalyptic number.

15278231 is a deficient number, since it is larger than the sum of its proper divisors (1).

15278231 is an equidigital number, since it uses as much as digits as its factorization.

15278231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 29.

The square root of 15278231 is about 3908.7377758044. The cubic root of 15278231 is about 248.1367124732.

The spelling of 15278231 in words is "fifteen million, two hundred seventy-eight thousand, two hundred thirty-one".