89661109 has 2 divisors, whose sum is σ = 89661110. Its totient is φ = 89661108.

The previous prime is 89661079. The next prime is 89661113. The reversal of 89661109 is 90116698.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59444100 + 30217009 = 7710^2 + 5497^2 .

It is a cyclic number.

It is not a de Polignac number, because 89661109 - 2¹¹ = 89659061 is a prime.

It is a super-2 number, since 2×89661109² = 16078228934219762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89661709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44830554 + 44830555.

It is an arithmetic number, because the mean of its divisors is an integer number (44830555).

Almost surely, 2^89661109 is an apocalyptic number.

It is an amenable number.

89661109 is a deficient number, since it is larger than the sum of its proper divisors (1).

89661109 is an equidigital number, since it uses as much as digits as its factorization.

89661109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 89661109 is about 9468.9550109819. The cubic root of 89661109 is about 447.5772828252.

The spelling of 89661109 in words is "eighty-nine million, six hundred sixty-one thousand, one hundred nine".