24991969 has 2 divisors, whose sum is σ = 24991970. Its totient is φ = 24991968.

The previous prime is 24991943. The next prime is 24991979. The reversal of 24991969 is 96919942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13601344 + 11390625 = 3688^2 + 3375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24991969 is a prime.

It is a super-2 number, since 2×24991969² = 1249197028993922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (24991979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12495984 + 12495985.

It is an arithmetic number, because the mean of its divisors is an integer number (12495985).

Almost surely, 2^24991969 is an apocalyptic number.

It is an amenable number.

24991969 is a deficient number, since it is larger than the sum of its proper divisors (1).

24991969 is an equidigital number, since it uses as much as digits as its factorization.

24991969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 49.

The square root of 24991969 is about 4999.1968354927. The cubic root of 24991969 is about 292.3704600860.

The spelling of 24991969 in words is "twenty-four million, nine hundred ninety-one thousand, nine hundred sixty-nine".