25573981 has 8 divisors (see below), whose sum is σ = 26966720. Its totient is φ = 24185952.

The previous prime is 25573979. The next prime is 25573997. The reversal of 25573981 is 18937552.

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 25573981 - 2¹ = 25573979 is a prime.

It is a super-2 number, since 2×25573981² = 1308057008376722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25573901) 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, 18976 + ... + 20278.

It is an arithmetic number, because the mean of its divisors is an integer number (3370840).

Almost surely, 2^25573981 is an apocalyptic number.

It is an amenable number.

25573981 is a deficient number, since it is larger than the sum of its proper divisors (1392739).

25573981 is a wasteful number, since it uses less digits than its factorization.

25573981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355.

The product of its digits is 75600, while the sum is 40.

The square root of 25573981 is about 5057.0723744079. The cubic root of 25573981 is about 294.6226372782.

The spelling of 25573981 in words is "twenty-five million, five hundred seventy-three thousand, nine hundred eighty-one".