89971547389 has 2 divisors, whose sum is σ = 89971547390. Its totient is φ = 89971547388.

The previous prime is 89971547311. The next prime is 89971547431. The reversal of 89971547389 is 98374517998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77682051225 + 12289496164 = 278715^2 + 110858^2 .

It is a cyclic number.

It is not a de Polignac number, because 89971547389 - 2⁹ = 89971546877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89971547489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44985773694 + 44985773695.

It is an arithmetic number, because the mean of its divisors is an integer number (44985773695).

Almost surely, 2^89971547389 is an apocalyptic number.

It is an amenable number.

89971547389 is a deficient number, since it is larger than the sum of its proper divisors (1).

89971547389 is an equidigital number, since it uses as much as digits as its factorization.

89971547389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 70.

The spelling of 89971547389 in words is "eighty-nine billion, nine hundred seventy-one million, five hundred forty-seven thousand, three hundred eighty-nine".