25516517 has 4 divisors (see below), whose sum is σ = 27479340. Its totient is φ = 23553696.

The previous prime is 25516511. The next prime is 25516537. The reversal of 25516517 is 71561552.

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 16760836 + 8755681 = 4094^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 25516517 - 2¹⁰ = 25515493 is a prime.

It is a super-2 number, since 2×25516517² = 1302185279622578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25516511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981392 + ... + 981417.

It is an arithmetic number, because the mean of its divisors is an integer number (6869835).

Almost surely, 2^25516517 is an apocalyptic number.

It is an amenable number.

25516517 is a deficient number, since it is larger than the sum of its proper divisors (1962823).

25516517 is a wasteful number, since it uses less digits than its factorization.

25516517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962822.

The product of its digits is 10500, while the sum is 32.

The square root of 25516517 is about 5051.3876311366. The cubic root of 25516517 is about 294.4018022606.

The spelling of 25516517 in words is "twenty-five million, five hundred sixteen thousand, five hundred seventeen".