25097881 has 4 divisors (see below), whose sum is σ = 25113700. Its totient is φ = 25082064.

The previous prime is 25097869. The next prime is 25097887. The reversal of 25097881 is 18879052.

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 11526025 + 13571856 = 3395^2 + 3684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25097881 is a prime.

It is a super-2 number, since 2×25097881² = 1259807261380322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25097887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5226 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (6278425).

Almost surely, 2^25097881 is an apocalyptic number.

It is an amenable number.

25097881 is a deficient number, since it is larger than the sum of its proper divisors (15819).

25097881 is a wasteful number, since it uses less digits than its factorization.

25097881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15818.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 25097881 is about 5009.7785380194. The cubic root of 25097881 is about 292.7828845801.

The spelling of 25097881 in words is "twenty-five million, ninety-seven thousand, eight hundred eighty-one".