25891349 has 4 divisors (see below), whose sum is σ = 28245120. Its totient is φ = 23537580.

The previous prime is 25891331. The next prime is 25891361. The reversal of 25891349 is 94319852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-25891349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25891309) 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, 1176869 + ... + 1176890.

It is an arithmetic number, because the mean of its divisors is an integer number (7061280).

Almost surely, 2^25891349 is an apocalyptic number.

It is an amenable number.

25891349 is a deficient number, since it is larger than the sum of its proper divisors (2353771).

25891349 is a wasteful number, since it uses less digits than its factorization.

25891349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353770.

The product of its digits is 77760, while the sum is 41.

The square root of 25891349 is about 5088.3542526047. The cubic root of 25891349 is about 295.8363663689.

The spelling of 25891349 in words is "twenty-five million, eight hundred ninety-one thousand, three hundred forty-nine".