24561989 has 2 divisors, whose sum is σ = 24561990. Its totient is φ = 24561988.

The previous prime is 24561983. The next prime is 24562007. The reversal of 24561989 is 98916542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 10349089 = 3770^2 + 3217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24561989 is a prime.

It is a super-2 number, since 2×24561989² = 1206582607272242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24561983) 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, 12280994 + 12280995.

It is an arithmetic number, because the mean of its divisors is an integer number (12280995).

Almost surely, 2^24561989 is an apocalyptic number.

It is an amenable number.

24561989 is a deficient number, since it is larger than the sum of its proper divisors (1).

24561989 is an equidigital number, since it uses as much as digits as its factorization.

24561989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 24561989 is about 4956.0053470512. The cubic root of 24561989 is about 290.6840333158.

The spelling of 24561989 in words is "twenty-four million, five hundred sixty-one thousand, nine hundred eighty-nine".