24981981 has 8 divisors (see below), whose sum is σ = 33344064. Its totient is φ = 16637280.

The previous prime is 24981973. The next prime is 24981991. The reversal of 24981981 is 18918942.

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

It is not a de Polignac number, because 24981981 - 2³ = 24981973 is a prime.

It is a super-2 number, since 2×24981981² = 1248198749368722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24981961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (4168008).

Almost surely, 2^24981981 is an apocalyptic number.

It is an amenable number.

24981981 is a deficient number, since it is larger than the sum of its proper divisors (8362083).

24981981 is a wasteful number, since it uses less digits than its factorization.

24981981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8691.

The product of its digits is 41472, while the sum is 42.

The square root of 24981981 is about 4998.1977751986. The cubic root of 24981981 is about 292.3315064358.

The spelling of 24981981 in words is "twenty-four million, nine hundred eighty-one thousand, nine hundred eighty-one".