89775661 has 2 divisors, whose sum is σ = 89775662. Its totient is φ = 89775660.

The previous prime is 89775611. The next prime is 89775683. The reversal of 89775661 is 16657798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89775625 + 36 = 9475^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 89775661 - 2⁷ = 89775533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89775611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44887830 + 44887831.

It is an arithmetic number, because the mean of its divisors is an integer number (44887831).

Almost surely, 2^89775661 is an apocalyptic number.

It is an amenable number.

89775661 is a deficient number, since it is larger than the sum of its proper divisors (1).

89775661 is an equidigital number, since it uses as much as digits as its factorization.

89775661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 49.

The square root of 89775661 is about 9475.0018997360. The cubic root of 89775661 is about 447.7678115625.

The spelling of 89775661 in words is "eighty-nine million, seven hundred seventy-five thousand, six hundred sixty-one".