25713521 has 4 divisors (see below), whose sum is σ = 25753200. Its totient is φ = 25673844.

The previous prime is 25713463. The next prime is 25713551. The reversal of 25713521 is 12531752.

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 25713521 - 2¹⁴ = 25697137 is a prime.

It is a super-2 number, since 2×25713521² = 1322370324434882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25713551) 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, 18851 + ... + 20168.

It is an arithmetic number, because the mean of its divisors is an integer number (6438300).

Almost surely, 2^25713521 is an apocalyptic number.

It is an amenable number.

25713521 is a deficient number, since it is larger than the sum of its proper divisors (39679).

25713521 is an equidigital number, since it uses as much as digits as its factorization.

25713521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39678.

The product of its digits is 2100, while the sum is 26.

The square root of 25713521 is about 5070.8501259651. The cubic root of 25713521 is about 295.1575180983.

It can be divided in two parts, 2571352 and 1, that added together give a cube (2571353 = 137³).

The spelling of 25713521 in words is "twenty-five million, seven hundred thirteen thousand, five hundred twenty-one".