89971439 has 2 divisors, whose sum is σ = 89971440. Its totient is φ = 89971438.

The previous prime is 89971433. The next prime is 89971471. The reversal of 89971439 is 93417998.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89971439 - 2¹⁶ = 89905903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89971433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44985719 + 44985720.

It is an arithmetic number, because the mean of its divisors is an integer number (44985720).

Almost surely, 2^89971439 is an apocalyptic number.

89971439 is a deficient number, since it is larger than the sum of its proper divisors (1).

89971439 is an equidigital number, since it uses as much as digits as its factorization.

89971439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 89971439 is about 9485.3275641909. The cubic root of 89971439 is about 448.0930646769.

The spelling of 89971439 in words is "eighty-nine million, nine hundred seventy-one thousand, four hundred thirty-nine".