25172491 has 2 divisors, whose sum is σ = 25172492. Its totient is φ = 25172490.

The previous prime is 25172471. The next prime is 25172561. The reversal of 25172491 is 19427152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25172491 - 2⁷ = 25172363 is a prime.

It is not a weakly prime, because it can be changed into another prime (25172431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12586245 + 12586246.

It is an arithmetic number, because the mean of its divisors is an integer number (12586246).

Almost surely, 2^25172491 is an apocalyptic number.

25172491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25172491 is an equidigital number, since it uses as much as digits as its factorization.

25172491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 25172491 is about 5017.2194490574. The cubic root of 25172491 is about 293.0727220702.

The spelling of 25172491 in words is "twenty-five million, one hundred seventy-two thousand, four hundred ninety-one".