24681989 has 2 divisors, whose sum is σ = 24681990. Its totient is φ = 24681988.

The previous prime is 24681971. The next prime is 24681991. The reversal of 24681989 is 98918642.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19731364 + 4950625 = 4442^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 24681989 - 2¹² = 24677893 is a prime.

It is a super-2 number, since 2×24681989² = 1218401161992242, which contains 22 as substring.

Together with 24681991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24681089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12340994 + 12340995.

It is an arithmetic number, because the mean of its divisors is an integer number (12340995).

Almost surely, 2^24681989 is an apocalyptic number.

It is an amenable number.

24681989 is a deficient number, since it is larger than the sum of its proper divisors (1).

24681989 is an equidigital number, since it uses as much as digits as its factorization.

24681989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 24681989 is about 4968.0971206288. The cubic root of 24681989 is about 291.1566528998.

The spelling of 24681989 in words is "twenty-four million, six hundred eighty-one thousand, nine hundred eighty-nine".