25713509 has 4 divisors (see below), whose sum is σ = 25862316. Its totient is φ = 25564704.

The previous prime is 25713463. The next prime is 25713551. The reversal of 25713509 is 90531752.

25713509 is nontrivially palindromic in base 14.

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 17430625 + 8282884 = 4175^2 + 2878^2 .

It is a cyclic number.

It is not a de Polignac number, because 25713509 - 2²⁴ = 8936293 is a prime.

It is a super-2 number, since 2×25713509² = 1322369090186162, 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 (25713599) 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, 74144 + ... + 74489.

It is an arithmetic number, because the mean of its divisors is an integer number (6465579).

Almost surely, 2^25713509 is an apocalyptic number.

It is an amenable number.

25713509 is a deficient number, since it is larger than the sum of its proper divisors (148807).

25713509 is a wasteful number, since it uses less digits than its factorization.

25713509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148806.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 25713509 is about 5070.8489427314. The cubic root of 25713509 is about 295.1574721835.

The spelling of 25713509 in words is "twenty-five million, seven hundred thirteen thousand, five hundred nine".