24991321 has 2 divisors, whose sum is σ = 24991322. Its totient is φ = 24991320.

The previous prime is 24991313. The next prime is 24991333. The reversal of 24991321 is 12319942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12880921 + 12110400 = 3589^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 24991321 - 2³ = 24991313 is a prime.

It is a super-2 number, since 2×24991321² = 1249132250650082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (24997321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12495660 + 12495661.

It is an arithmetic number, because the mean of its divisors is an integer number (12495661).

Almost surely, 2^24991321 is an apocalyptic number.

It is an amenable number.

24991321 is a deficient number, since it is larger than the sum of its proper divisors (1).

24991321 is an equidigital number, since it uses as much as digits as its factorization.

24991321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 24991321 is about 4999.1320246619. The cubic root of 24991321 is about 292.3679331717.

The spelling of 24991321 in words is "twenty-four million, nine hundred ninety-one thousand, three hundred twenty-one".