25147981 has 8 divisors (see below), whose sum is σ = 27025920. Its totient is φ = 23314368.

The previous prime is 25147949. The next prime is 25148027. The reversal of 25147981 is 18974152.

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 25147981 - 2⁵ = 25147949 is a prime.

It is a super-2 number, since 2×25147981² = 1264841896752722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25147981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25147181) 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 7 ways as a sum of consecutive naturals, for example, 9901 + ... + 12178.

It is an arithmetic number, because the mean of its divisors is an integer number (3378240).

Almost surely, 2^25147981 is an apocalyptic number.

It is an amenable number.

25147981 is a deficient number, since it is larger than the sum of its proper divisors (1877939).

25147981 is a wasteful number, since it uses less digits than its factorization.

25147981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22163.

The product of its digits is 20160, while the sum is 37.

The square root of 25147981 is about 5014.7762661957. The cubic root of 25147981 is about 292.9775713087.

The spelling of 25147981 in words is "twenty-five million, one hundred forty-seven thousand, nine hundred eighty-one".