25556471 has 4 divisors (see below), whose sum is σ = 25585200. Its totient is φ = 25527744.

The previous prime is 25556459. The next prime is 25556507. The reversal of 25556471 is 17465552.

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

It is a cyclic number.

It is not a de Polignac number, because 25556471 - 2²² = 21362167 is a prime.

It is a super-3 number, since 3×25556471³ (a number of 23 digits) contains 333 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 (25556411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12986 + ... + 14823.

It is an arithmetic number, because the mean of its divisors is an integer number (6396300).

Almost surely, 2^25556471 is an apocalyptic number.

25556471 is a deficient number, since it is larger than the sum of its proper divisors (28729).

25556471 is an equidigital number, since it uses as much as digits as its factorization.

25556471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28728.

The product of its digits is 42000, while the sum is 35.

The square root of 25556471 is about 5055.3408391522. The cubic root of 25556471 is about 294.5553811581. Note that the first 3 decimals are identical.

The spelling of 25556471 in words is "twenty-five million, five hundred fifty-six thousand, four hundred seventy-one".