25487291 has 2 divisors, whose sum is σ = 25487292. Its totient is φ = 25487290.

The previous prime is 25487257. The next prime is 25487309. The reversal of 25487291 is 19278452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25487291 is a prime.

It is not a weakly prime, because it can be changed into another prime (25487221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12743645 + 12743646.

It is an arithmetic number, because the mean of its divisors is an integer number (12743646).

Almost surely, 2^25487291 is an apocalyptic number.

25487291 is a deficient number, since it is larger than the sum of its proper divisors (1).

25487291 is an equidigital number, since it uses as much as digits as its factorization.

25487291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 25487291 is about 5048.4939338381. The cubic root of 25487291 is about 294.2893590906.

The spelling of 25487291 in words is "twenty-five million, four hundred eighty-seven thousand, two hundred ninety-one".