25701521 has 4 divisors (see below), whose sum is σ = 26137200. Its totient is φ = 25265844.

The previous prime is 25701497. The next prime is 25701539. The reversal of 25701521 is 12510752.

It is a happy number.

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 25701521 - 2²² = 21507217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25701541) 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, 217751 + ... + 217868.

It is an arithmetic number, because the mean of its divisors is an integer number (6534300).

Almost surely, 2^25701521 is an apocalyptic number.

It is an amenable number.

25701521 is a deficient number, since it is larger than the sum of its proper divisors (435679).

25701521 is an equidigital number, since it uses as much as digits as its factorization.

25701521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435678.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 25701521 is about 5069.6667543341. Note that the first 3 decimals coincide. The cubic root of 25701521 is about 295.1115961968. Note that the first 3 decimals are identical.

The spelling of 25701521 in words is "twenty-five million, seven hundred one thousand, five hundred twenty-one".