25765513 has 4 divisors (see below), whose sum is σ = 25788688. Its totient is φ = 25742340.

The previous prime is 25765511. The next prime is 25765517. The reversal of 25765513 is 31556752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25765513 - 2¹ = 25765511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25765511) 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, 9831 + ... + 12172.

It is an arithmetic number, because the mean of its divisors is an integer number (6447172).

Almost surely, 2^25765513 is an apocalyptic number.

It is an amenable number.

25765513 is a deficient number, since it is larger than the sum of its proper divisors (23175).

25765513 is a wasteful number, since it uses less digits than its factorization.

25765513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23174.

The product of its digits is 31500, while the sum is 34.

The square root of 25765513 is about 5075.9740937085. The cubic root of 25765513 is about 295.3563175074.

The spelling of 25765513 in words is "twenty-five million, seven hundred sixty-five thousand, five hundred thirteen".