25215953 has 4 divisors (see below), whose sum is σ = 28818240. Its totient is φ = 21613668.

The previous prime is 25215917. The next prime is 25215979. The reversal of 25215953 is 35951252.

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 a de Polignac number, because none of the positive numbers 2^k-25215953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25215353) 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, 1801133 + ... + 1801146.

It is an arithmetic number, because the mean of its divisors is an integer number (7204560).

Almost surely, 2^25215953 is an apocalyptic number.

It is an amenable number.

25215953 is a deficient number, since it is larger than the sum of its proper divisors (3602287).

25215953 is an equidigital number, since it uses as much as digits as its factorization.

25215953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3602286.

The product of its digits is 13500, while the sum is 32.

The square root of 25215953 is about 5021.5488646433. The cubic root of 25215953 is about 293.2412950168.

The spelling of 25215953 in words is "twenty-five million, two hundred fifteen thousand, nine hundred fifty-three".