89720549 has 2 divisors, whose sum is σ = 89720550. Its totient is φ = 89720548.

The previous prime is 89720483. The next prime is 89720551. The reversal of 89720549 is 94502798.

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., 51984100 + 37736449 = 7210^2 + 6143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89720549 is a prime.

It is a super-2 number, since 2×89720549² = 16099553825722802, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 89720551, 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 (89720599) 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, 44860274 + 44860275.

It is an arithmetic number, because the mean of its divisors is an integer number (44860275).

Almost surely, 2^89720549 is an apocalyptic number.

It is an amenable number.

89720549 is a deficient number, since it is larger than the sum of its proper divisors (1).

89720549 is an equidigital number, since it uses as much as digits as its factorization.

89720549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 89720549 is about 9472.0931688830. The cubic root of 89720549 is about 447.6761667121.

The spelling of 89720549 in words is "eighty-nine million, seven hundred twenty thousand, five hundred forty-nine".