89785921 has 2 divisors, whose sum is σ = 89785922. Its totient is φ = 89785920.

The previous prime is 89785919. The next prime is 89785931. The reversal of 89785921 is 12958798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80299521 + 9486400 = 8961^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 89785921 - 2¹ = 89785919 is a prime.

Together with 89785919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (89785901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44892960 + 44892961.

It is an arithmetic number, because the mean of its divisors is an integer number (44892961).

Almost surely, 2^89785921 is an apocalyptic number.

It is an amenable number.

89785921 is a deficient number, since it is larger than the sum of its proper divisors (1).

89785921 is an equidigital number, since it uses as much as digits as its factorization.

89785921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 89785921 is about 9475.5433089612. The cubic root of 89785921 is about 447.7848686085.

The spelling of 89785921 in words is "eighty-nine million, seven hundred eighty-five thousand, nine hundred twenty-one".