25281997 has 8 divisors (see below), whose sum is σ = 28166040. Its totient is φ = 22532160.

The previous prime is 25281961. The next prime is 25282001. The reversal of 25281997 is 79918252.

It can be written as a sum of positive squares in 4 ways, for example, as 391876 + 24890121 = 626^2 + 4989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25281997 - 2⁷ = 25281869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25281947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33154 + ... + 33907.

It is an arithmetic number, because the mean of its divisors is an integer number (3520755).

Almost surely, 2^25281997 is an apocalyptic number.

It is an amenable number.

25281997 is a deficient number, since it is larger than the sum of its proper divisors (2884043).

25281997 is a wasteful number, since it uses less digits than its factorization.

25281997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67103.

The product of its digits is 90720, while the sum is 43.

The square root of 25281997 is about 5028.1206230559. The cubic root of 25281997 is about 293.4970847349.

The spelling of 25281997 in words is "twenty-five million, two hundred eighty-one thousand, nine hundred ninety-seven".