25498991 has 8 divisors (see below), whose sum is σ = 29220864. Its totient is φ = 21796920.

The previous prime is 25498981. The next prime is 25498999. The reversal of 25498991 is 19989452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25498991 - 2¹⁸ = 25236847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25498999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2075 + ... + 7436.

It is an arithmetic number, because the mean of its divisors is an integer number (3652608).

Almost surely, 2^25498991 is an apocalyptic number.

25498991 is a deficient number, since it is larger than the sum of its proper divisors (3721873).

25498991 is an equidigital number, since it uses as much as digits as its factorization.

25498991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9901.

The product of its digits is 233280, while the sum is 47.

The square root of 25498991 is about 5049.6525623056. The cubic root of 25498991 is about 294.3343836059.

The spelling of 25498991 in words is "twenty-five million, four hundred ninety-eight thousand, nine hundred ninety-one".