89712991 has 2 divisors, whose sum is σ = 89712992. Its totient is φ = 89712990.

The previous prime is 89712937. The next prime is 89713009. The reversal of 89712991 is 19921798.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89712991 - 2¹⁹ = 89188703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89712191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44856495 + 44856496.

It is an arithmetic number, because the mean of its divisors is an integer number (44856496).

Almost surely, 2^89712991 is an apocalyptic number.

89712991 is a deficient number, since it is larger than the sum of its proper divisors (1).

89712991 is an equidigital number, since it uses as much as digits as its factorization.

89712991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 46.

The square root of 89712991 is about 9471.6941990332. The cubic root of 89712991 is about 447.6635957106.

The spelling of 89712991 in words is "eighty-nine million, seven hundred twelve thousand, nine hundred ninety-one".