15855131 has 2 divisors, whose sum is σ = 15855132. Its totient is φ = 15855130.

The previous prime is 15855113. The next prime is 15855157. The reversal of 15855131 is 13155851.

Together with previous prime (15855113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13155851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15855131 is a prime.

It is a super-2 number, since 2×15855131² = 502770358054322, 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 = 15855094 and 15855103.

It is not a weakly prime, because it can be changed into another prime (15855331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7927565 + 7927566.

It is an arithmetic number, because the mean of its divisors is an integer number (7927566).

Almost surely, 2^15855131 is an apocalyptic number.

15855131 is a deficient number, since it is larger than the sum of its proper divisors (1).

15855131 is an equidigital number, since it uses as much as digits as its factorization.

15855131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 29.

The square root of 15855131 is about 3981.8501980863. The cubic root of 15855131 is about 251.2213884567.

The spelling of 15855131 in words is "fifteen million, eight hundred fifty-five thousand, one hundred thirty-one".