24981991 has 2 divisors, whose sum is σ = 24981992. Its totient is φ = 24981990.

The previous prime is 24981973. The next prime is 24982049. The reversal of 24981991 is 19918942.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 24981991 - 2⁹ = 24981479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24981961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12490995 + 12490996.

It is an arithmetic number, because the mean of its divisors is an integer number (12490996).

Almost surely, 2^24981991 is an apocalyptic number.

24981991 is a deficient number, since it is larger than the sum of its proper divisors (1).

24981991 is an equidigital number, since it uses as much as digits as its factorization.

24981991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 43.

The square root of 24981991 is about 4998.1987755591. The cubic root of 24981991 is about 292.3315454414.

It can be divided in two parts, 2498 and 1991, that added together give a square (4489 = 67²).

The spelling of 24981991 in words is "twenty-four million, nine hundred eighty-one thousand, nine hundred ninety-one".