89878961 has 2 divisors, whose sum is σ = 89878962. Its totient is φ = 89878960.

The previous prime is 89878927. The next prime is 89878967. The reversal of 89878961 is 16987898.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72573361 + 17305600 = 8519^2 + 4160^2 .

It is a cyclic number.

It is not a de Polignac number, because 89878961 - 2⁶ = 89878897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 89878897 and 89878906.

It is not a weakly prime, because it can be changed into another prime (89878967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44939480 + 44939481.

It is an arithmetic number, because the mean of its divisors is an integer number (44939481).

Almost surely, 2^89878961 is an apocalyptic number.

It is an amenable number.

89878961 is a deficient number, since it is larger than the sum of its proper divisors (1).

89878961 is an equidigital number, since it uses as much as digits as its factorization.

89878961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 56.

The square root of 89878961 is about 9480.4515187833. The cubic root of 89878961 is about 447.9394864720.

The spelling of 89878961 in words is "eighty-nine million, eight hundred seventy-eight thousand, nine hundred sixty-one".