25861091 has 4 divisors (see below), whose sum is σ = 26019912. Its totient is φ = 25702272.

The previous prime is 25861081. The next prime is 25861093. The reversal of 25861091 is 19016852.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25861091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25861093) 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, 79166 + ... + 79491.

It is an arithmetic number, because the mean of its divisors is an integer number (6504978).

Almost surely, 2^25861091 is an apocalyptic number.

25861091 is a deficient number, since it is larger than the sum of its proper divisors (158821).

25861091 is a wasteful number, since it uses less digits than its factorization.

25861091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158820.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 25861091 is about 5085.3801234519. The cubic root of 25861091 is about 295.7210781044.

The spelling of 25861091 in words is "twenty-five million, eight hundred sixty-one thousand, ninety-one".