25705091 has 4 divisors (see below), whose sum is σ = 25838472. Its totient is φ = 25571712.

The previous prime is 25705087. The next prime is 25705093. The reversal of 25705091 is 19050752.

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

It is a cyclic number.

It is not a de Polignac number, because 25705091 - 2² = 25705087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25705093) 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, 66401 + ... + 66786.

It is an arithmetic number, because the mean of its divisors is an integer number (6459618).

Almost surely, 2^25705091 is an apocalyptic number.

25705091 is a deficient number, since it is larger than the sum of its proper divisors (133381).

25705091 is a wasteful number, since it uses less digits than its factorization.

25705091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133380.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 25705091 is about 5070.0188362569. The cubic root of 25705091 is about 295.1252594559.

The spelling of 25705091 in words is "twenty-five million, seven hundred five thousand, ninety-one".