25506261 has 12 divisors (see below), whose sum is σ = 40191840. Its totient is φ = 15458280.

The previous prime is 25506259. The next prime is 25506263. The reversal of 25506261 is 16260552.

It is an interprime number because it is at equal distance from previous prime (25506259) and next prime (25506263).

It is not a de Polignac number, because 25506261 - 2¹ = 25506259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25506263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128721 + ... + 128918.

It is an arithmetic number, because the mean of its divisors is an integer number (3349320).

Almost surely, 2^25506261 is an apocalyptic number.

It is an amenable number.

25506261 is a deficient number, since it is larger than the sum of its proper divisors (14685579).

25506261 is a wasteful number, since it uses less digits than its factorization.

25506261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257656 (or 257653 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25506261 is about 5050.3723625095. The cubic root of 25506261 is about 294.3623534400.

The spelling of 25506261 in words is "twenty-five million, five hundred six thousand, two hundred sixty-one".