25555971 has 8 divisors (see below), whose sum is σ = 38942464. Its totient is φ = 14603400.

The previous prime is 25555961. The next prime is 25555979. The reversal of 25555971 is 17955552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25555971 - 2⁵ = 25555939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25555979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608455 + ... + 608496.

It is an arithmetic number, because the mean of its divisors is an integer number (4867808).

Almost surely, 2^25555971 is an apocalyptic number.

25555971 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25555971 is a deficient number, since it is larger than the sum of its proper divisors (13386493).

25555971 is a wasteful number, since it uses less digits than its factorization.

25555971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216961.

The product of its digits is 78750, while the sum is 39.

The square root of 25555971 is about 5055.2913862605. The cubic root of 25555971 is about 294.5534602011.

The spelling of 25555971 in words is "twenty-five million, five hundred fifty-five thousand, nine hundred seventy-one".