24781213 has 2 divisors, whose sum is σ = 24781214. Its totient is φ = 24781212.

The previous prime is 24781177. The next prime is 24781217. The reversal of 24781213 is 31218742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24780484 + 729 = 4978^2 + 27^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24781213 is a prime.

It is a super-2 number, since 2×24781213² = 1228217035502738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24781217) 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 as a sum of consecutive naturals, namely, 12390606 + 12390607.

It is an arithmetic number, because the mean of its divisors is an integer number (12390607).

Almost surely, 2^24781213 is an apocalyptic number.

It is an amenable number.

24781213 is a deficient number, since it is larger than the sum of its proper divisors (1).

24781213 is an equidigital number, since it uses as much as digits as its factorization.

24781213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 24781213 is about 4978.0732216391. The cubic root of 24781213 is about 291.5462906067.

Adding to 24781213 its reverse (31218742), we get a palindrome (55999955).

The spelling of 24781213 in words is "twenty-four million, seven hundred eighty-one thousand, two hundred thirteen".