89242421 has 2 divisors, whose sum is σ = 89242422. Its totient is φ = 89242420.

The previous prime is 89242403. The next prime is 89242423. The reversal of 89242421 is 12424298.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70795396 + 18447025 = 8414^2 + 4295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89242421 is a prime.

It is a Sophie Germain prime.

Together with 89242423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89242423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44621210 + 44621211.

It is an arithmetic number, because the mean of its divisors is an integer number (44621211).

Almost surely, 2^89242421 is an apocalyptic number.

It is an amenable number.

89242421 is a deficient number, since it is larger than the sum of its proper divisors (1).

89242421 is an equidigital number, since it uses as much as digits as its factorization.

89242421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 32.

The square root of 89242421 is about 9446.8206821131. The cubic root of 89242421 is about 446.8795158296.

It can be divided in two parts, 8 and 9242421, that added together give a palindrome (9242429).

The spelling of 89242421 in words is "eighty-nine million, two hundred forty-two thousand, four hundred twenty-one".