89661857 has 2 divisors, whose sum is σ = 89661858. Its totient is φ = 89661856.

The previous prime is 89661851. The next prime is 89661917. The reversal of 89661857 is 75816698.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56010256 + 33651601 = 7484^2 + 5801^2 .

It is a cyclic number.

It is not a de Polignac number, because 89661857 - 2¹⁴ = 89645473 is a prime.

It is not a weakly prime, because it can be changed into another prime (89661851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44830928 + 44830929.

It is an arithmetic number, because the mean of its divisors is an integer number (44830929).

Almost surely, 2^89661857 is an apocalyptic number.

It is an amenable number.

89661857 is a deficient number, since it is larger than the sum of its proper divisors (1).

89661857 is an equidigital number, since it uses as much as digits as its factorization.

89661857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 89661857 is about 9468.9945083942. The cubic root of 89661857 is about 447.5785274632.

The spelling of 89661857 in words is "eighty-nine million, six hundred sixty-one thousand, eight hundred fifty-seven".