25721359 has 4 divisors (see below), whose sum is σ = 25745904. Its totient is φ = 25696816.

The previous prime is 25721329. The next prime is 25721363. The reversal of 25721359 is 95312752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25721359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25721329) 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, 10627 + ... + 12820.

It is an arithmetic number, because the mean of its divisors is an integer number (6436476).

Almost surely, 2^25721359 is an apocalyptic number.

25721359 is a deficient number, since it is larger than the sum of its proper divisors (24545).

25721359 is a wasteful number, since it uses less digits than its factorization.

25721359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24544.

The product of its digits is 18900, while the sum is 34.

The square root of 25721359 is about 5071.6229157933. The cubic root of 25721359 is about 295.1875050405.

The spelling of 25721359 in words is "twenty-five million, seven hundred twenty-one thousand, three hundred fifty-nine".