25156987 has 2 divisors, whose sum is σ = 25156988. Its totient is φ = 25156986.

The previous prime is 25156981. The next prime is 25157017. The reversal of 25156987 is 78965152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25156987 - 2²³ = 16768379 is a prime.

It is a super-3 number, since 3×25156987³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (25156981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12578493 + 12578494.

It is an arithmetic number, because the mean of its divisors is an integer number (12578494).

Almost surely, 2^25156987 is an apocalyptic number.

25156987 is a deficient number, since it is larger than the sum of its proper divisors (1).

25156987 is an equidigital number, since it uses as much as digits as its factorization.

25156987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 25156987 is about 5015.6741321581. The cubic root of 25156987 is about 293.0125408634.

The spelling of 25156987 in words is "twenty-five million, one hundred fifty-six thousand, nine hundred eighty-seven".