25516971 has 16 divisors (see below), whose sum is σ = 38425120. Its totient is φ = 16731360.

The previous prime is 25516961. The next prime is 25516979. The reversal of 25516971 is 17961552.

It is not a de Polignac number, because 25516971 - 2¹⁹ = 24992683 is a prime.

It is a super-2 number, since 2×25516971² = 1302231618029682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25516979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6100 + ... + 9393.

It is an arithmetic number, because the mean of its divisors is an integer number (2401570).

Almost surely, 2^25516971 is an apocalyptic number.

25516971 is a deficient number, since it is larger than the sum of its proper divisors (12908149).

25516971 is a wasteful number, since it uses less digits than its factorization.

25516971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15563 (or 15557 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 25516971 is about 5051.4325690837. The cubic root of 25516971 is about 294.4035482882.

The spelling of 25516971 in words is "twenty-five million, five hundred sixteen thousand, nine hundred seventy-one".