25571551 has 6 divisors (see below), whose sum is σ = 26282760. Its totient is φ = 24879096.

The previous prime is 25571537. The next prime is 25571639. The reversal of 25571551 is 15517552.

It is not a de Polignac number, because 25571551 - 2¹⁷ = 25440479 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 (25571851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7971 + ... + 10708.

It is an arithmetic number, because the mean of its divisors is an integer number (4380460).

Almost surely, 2^25571551 is an apocalyptic number.

25571551 is a deficient number, since it is larger than the sum of its proper divisors (711209).

25571551 is an equidigital number, since it uses as much as digits as its factorization.

25571551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18753 (or 18716 counting only the distinct ones).

The product of its digits is 8750, while the sum is 31.

The square root of 25571551 is about 5056.8321111146. The cubic root of 25571551 is about 294.6133054540.

The spelling of 25571551 in words is "twenty-five million, five hundred seventy-one thousand, five hundred fifty-one".