25571009 has 12 divisors (see below), whose sum is σ = 28352064. Its totient is φ = 23014464.

The previous prime is 25570997. The next prime is 25571023. The reversal of 25571009 is 90017552.

It is a de Polignac number, because none of the positive numbers 2^k-25571009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25571059) 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 11 ways as a sum of consecutive naturals, for example, 4724 + ... + 8570.

It is an arithmetic number, because the mean of its divisors is an integer number (2362672).

Almost surely, 2^25571009 is an apocalyptic number.

It is an amenable number.

25571009 is a deficient number, since it is larger than the sum of its proper divisors (2781055).

25571009 is a wasteful number, since it uses less digits than its factorization.

25571009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904 (or 3887 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 25571009 is about 5056.7785199670. The cubic root of 25571009 is about 294.6112239542.

The spelling of 25571009 in words is "twenty-five million, five hundred seventy-one thousand, nine".