25007981 has 4 divisors (see below), whose sum is σ = 25044864. Its totient is φ = 24971100.

The previous prime is 25007929. The next prime is 25007993. The reversal of 25007981 is 18970052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25007981 - 2¹⁴ = 24991597 is a prime.

It is a super-2 number, since 2×25007981² = 1250798227392722, which contains 22 as substring.

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 (25007921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17405 + ... + 18786.

It is an arithmetic number, because the mean of its divisors is an integer number (6261216).

Almost surely, 2^25007981 is an apocalyptic number.

It is an amenable number.

25007981 is a deficient number, since it is larger than the sum of its proper divisors (36883).

25007981 is an equidigital number, since it uses as much as digits as its factorization.

25007981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36882.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 25007981 is about 5000.7980363138. The cubic root of 25007981 is about 292.4328859582.

The spelling of 25007981 in words is "twenty-five million, seven thousand, nine hundred eighty-one".