25771897 has 4 divisors (see below), whose sum is σ = 25882740. Its totient is φ = 25661056.

The previous prime is 25771877. The next prime is 25771901. The reversal of 25771897 is 79817752.

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 14622976 + 11148921 = 3824^2 + 3339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25771897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25771877) 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, 55072 + ... + 55537.

It is an arithmetic number, because the mean of its divisors is an integer number (6470685).

Almost surely, 2^25771897 is an apocalyptic number.

It is an amenable number.

25771897 is a deficient number, since it is larger than the sum of its proper divisors (110843).

25771897 is a wasteful number, since it uses less digits than its factorization.

25771897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110842.

The product of its digits is 246960, while the sum is 46.

The square root of 25771897 is about 5076.6028995776. The cubic root of 25771897 is about 295.3807092725.

The spelling of 25771897 in words is "twenty-five million, seven hundred seventy-one thousand, eight hundred ninety-seven".