25991465 has 8 divisors (see below), whose sum is σ = 31778568. Its totient is φ = 20400640.

The previous prime is 25991461. The next prime is 25991509. The reversal of 25991465 is 56419952.

It can be written as a sum of positive squares in 4 ways, for example, as 478864 + 25512601 = 692^2 + 5051^2 .

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

It is not a de Polignac number, because 25991465 - 2² = 25991461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25991461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48776 + ... + 49305.

It is an arithmetic number, because the mean of its divisors is an integer number (3972321).

Almost surely, 2^25991465 is an apocalyptic number.

It is an amenable number.

25991465 is a deficient number, since it is larger than the sum of its proper divisors (5787103).

25991465 is an equidigital number, since it uses as much as digits as its factorization.

25991465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98139.

The product of its digits is 97200, while the sum is 41.

The square root of 25991465 is about 5098.1825192906. The cubic root of 25991465 is about 296.2171867495.

The spelling of 25991465 in words is "twenty-five million, nine hundred ninety-one thousand, four hundred sixty-five".