89961661 has 2 divisors, whose sum is σ = 89961662. Its totient is φ = 89961660.

The previous prime is 89961653. The next prime is 89961691. The reversal of 89961661 is 16616998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 22146436 = 8235^2 + 4706^2 .

It is a cyclic number.

It is not a de Polignac number, because 89961661 - 2³ = 89961653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89961601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44980830 + 44980831.

It is an arithmetic number, because the mean of its divisors is an integer number (44980831).

Almost surely, 2^89961661 is an apocalyptic number.

It is an amenable number.

89961661 is a deficient number, since it is larger than the sum of its proper divisors (1).

89961661 is an equidigital number, since it uses as much as digits as its factorization.

89961661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 89961661 is about 9484.8121225462. The cubic root of 89961661 is about 448.0768313301.

The spelling of 89961661 in words is "eighty-nine million, nine hundred sixty-one thousand, six hundred sixty-one".