25365981 has 8 divisors (see below), whose sum is σ = 34987680. Its totient is φ = 16327472.

The previous prime is 25365943. The next prime is 25365983. The reversal of 25365981 is 18956352.

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

It is a cyclic number.

It is not a de Polignac number, because 25365981 - 2¹³ = 25357789 is a prime.

It is a super-2 number, since 2×25365981² = 1286865984184722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25365983) 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 7 ways as a sum of consecutive naturals, for example, 145695 + ... + 145868.

It is an arithmetic number, because the mean of its divisors is an integer number (4373460).

Almost surely, 2^25365981 is an apocalyptic number.

It is an amenable number.

25365981 is a deficient number, since it is larger than the sum of its proper divisors (9621699).

25365981 is a wasteful number, since it uses less digits than its factorization.

25365981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291595.

The product of its digits is 64800, while the sum is 39.

The square root of 25365981 is about 5036.4651294335. The cubic root of 25365981 is about 293.8217138324.

The spelling of 25365981 in words is "twenty-five million, three hundred sixty-five thousand, nine hundred eighty-one".