89236781 has 2 divisors, whose sum is σ = 89236782. Its totient is φ = 89236780.

The previous prime is 89236751. The next prime is 89236793. The reversal of 89236781 is 18763298.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84015556 + 5221225 = 9166^2 + 2285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89236781 is a prime.

It is a super-2 number, since 2×89236781² = 15926406166483922, which contains 22 as substring.

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 congruent number.

It is not a weakly prime, because it can be changed into another prime (89236751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44618390 + 44618391.

It is an arithmetic number, because the mean of its divisors is an integer number (44618391).

Almost surely, 2^89236781 is an apocalyptic number.

It is an amenable number.

89236781 is a deficient number, since it is larger than the sum of its proper divisors (1).

89236781 is an equidigital number, since it uses as much as digits as its factorization.

89236781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 89236781 is about 9446.5221642677. The cubic root of 89236781 is about 446.8701015715.

It can be divided in two parts, 892 and 36781, that added together give a palindrome (37673).

The spelling of 89236781 in words is "eighty-nine million, two hundred thirty-six thousand, seven hundred eighty-one".