25139287 has 2 divisors, whose sum is σ = 25139288. Its totient is φ = 25139286.

The previous prime is 25139281. The next prime is 25139291. The reversal of 25139287 is 78293152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25139287 - 2⁷ = 25139159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25139281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12569643 + 12569644.

It is an arithmetic number, because the mean of its divisors is an integer number (12569644).

Almost surely, 2^25139287 is an apocalyptic number.

25139287 is a deficient number, since it is larger than the sum of its proper divisors (1).

25139287 is an equidigital number, since it uses as much as digits as its factorization.

25139287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 25139287 is about 5013.9093529899. The cubic root of 25139287 is about 292.9438053032.

It can be divided in two parts, 2 and 5139287, that added together give a square (5139289 = 2267²).

The spelling of 25139287 in words is "twenty-five million, one hundred thirty-nine thousand, two hundred eighty-seven".