25690161 has 12 divisors (see below), whose sum is σ = 39846192. Its totient is φ = 14680008.

The previous prime is 25690141. The next prime is 25690177. The reversal of 25690161 is 16109652.

It is not a de Polignac number, because 25690161 - 2⁵ = 25690129 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (25690121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87235 + ... + 87528.

It is an arithmetic number, because the mean of its divisors is an integer number (3320516).

Almost surely, 2^25690161 is an apocalyptic number.

25690161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25690161 is a deficient number, since it is larger than the sum of its proper divisors (14156031).

25690161 is a wasteful number, since it uses less digits than its factorization.

25690161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174780 (or 174773 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 25690161 is about 5068.5462412806. The cubic root of 25690161 is about 295.0681102908.

The spelling of 25690161 in words is "twenty-five million, six hundred ninety thousand, one hundred sixty-one".