25813971 has 10 divisors (see below), whose sum is σ = 38561732. Its totient is φ = 17209260.

The previous prime is 25813937. The next prime is 25813999. The reversal of 25813971 is 17931852.

25813971 is a `hidden beast` number, since 2 + 581 + 3 + 9 + 71 = 666.

It is not a de Polignac number, because 25813971 - 2¹⁰ = 25812947 is a prime.

It is a super-2 number, since 2×25813971² = 1332722197577682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25813771) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 159265 + ... + 159426.

Almost surely, 2^25813971 is an apocalyptic number.

25813971 is a deficient number, since it is larger than the sum of its proper divisors (12747761).

25813971 is an equidigital number, since it uses as much as digits as its factorization.

25813971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318703 (or 318694 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 25813971 is about 5080.7451225189. The cubic root of 25813971 is about 295.5413634798.

The spelling of 25813971 in words is "twenty-five million, eight hundred thirteen thousand, nine hundred seventy-one".