89091557 has 2 divisors, whose sum is σ = 89091558. Its totient is φ = 89091556.

The previous prime is 89091533. The next prime is 89091559. The reversal of 89091557 is 75519098.

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., 58277956 + 30813601 = 7634^2 + 5551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89091557 is a prime.

Together with 89091559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89091559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44545778 + 44545779.

It is an arithmetic number, because the mean of its divisors is an integer number (44545779).

Almost surely, 2^89091557 is an apocalyptic number.

It is an amenable number.

89091557 is a deficient number, since it is larger than the sum of its proper divisors (1).

89091557 is an equidigital number, since it uses as much as digits as its factorization.

89091557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 89091557 is about 9438.8323960117. The cubic root of 89091557 is about 446.6275577129.

The spelling of 89091557 in words is "eighty-nine million, ninety-one thousand, five hundred fifty-seven".