89020781 has 2 divisors, whose sum is σ = 89020782. Its totient is φ = 89020780.

The previous prime is 89020769. The next prime is 89020801. The reversal of 89020781 is 18702098.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 34703881 = 7370^2 + 5891^2 .

It is a cyclic number.

It is not a de Polignac number, because 89020781 - 2¹⁰ = 89019757 is a prime.

It is a super-2 number, since 2×89020781² = 15849398899699922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89020081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44510390 + 44510391.

It is an arithmetic number, because the mean of its divisors is an integer number (44510391).

Almost surely, 2^89020781 is an apocalyptic number.

It is an amenable number.

89020781 is a deficient number, since it is larger than the sum of its proper divisors (1).

89020781 is an equidigital number, since it uses as much as digits as its factorization.

89020781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 89020781 is about 9435.0824585692. The cubic root of 89020781 is about 446.5092566174.

The spelling of 89020781 in words is "eighty-nine million, twenty thousand, seven hundred eighty-one".