25891489 has 4 divisors (see below), whose sum is σ = 27883156. Its totient is φ = 23899824.

The previous prime is 25891487. The next prime is 25891543. The reversal of 25891489 is 98419852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14500864 + 11390625 = 3808^2 + 3375^2 .

It is not a de Polignac number, because 25891489 - 2¹ = 25891487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25891487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995814 + ... + 995839.

It is an arithmetic number, because the mean of its divisors is an integer number (6970789).

Almost surely, 2^25891489 is an apocalyptic number.

It is an amenable number.

25891489 is a deficient number, since it is larger than the sum of its proper divisors (1991667).

25891489 is a wasteful number, since it uses less digits than its factorization.

25891489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991666.

The product of its digits is 207360, while the sum is 46.

The square root of 25891489 is about 5088.3680094899. The cubic root of 25891489 is about 295.8368995845.

The spelling of 25891489 in words is "twenty-five million, eight hundred ninety-one thousand, four hundred eighty-nine".