89771557 has 2 divisors, whose sum is σ = 89771558. Its totient is φ = 89771556.

The previous prime is 89771537. The next prime is 89771569. The reversal of 89771557 is 75517798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80030916 + 9740641 = 8946^2 + 3121^2 .

It is a cyclic number.

It is not a de Polignac number, because 89771557 - 2¹⁹ = 89247269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 89771557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89771537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44885778 + 44885779.

It is an arithmetic number, because the mean of its divisors is an integer number (44885779).

Almost surely, 2^89771557 is an apocalyptic number.

It is an amenable number.

89771557 is a deficient number, since it is larger than the sum of its proper divisors (1).

89771557 is an equidigital number, since it uses as much as digits as its factorization.

89771557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 617400, while the sum is 49.

The square root of 89771557 is about 9474.7853273834. The cubic root of 89771557 is about 447.7609883802.

The spelling of 89771557 in words is "eighty-nine million, seven hundred seventy-one thousand, five hundred fifty-seven".