81030889 has 2 divisors, whose sum is σ = 81030890. Its totient is φ = 81030888.

The previous prime is 81030871. The next prime is 81030899. The reversal of 81030889 is 98803018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 32867289 = 6940^2 + 5733^2 .

It is a cyclic number.

It is not a de Polignac number, because 81030889 - 2⁹ = 81030377 is a prime.

It is not a weakly prime, because it can be changed into another prime (81030899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40515444 + 40515445.

It is an arithmetic number, because the mean of its divisors is an integer number (40515445).

Almost surely, 2^81030889 is an apocalyptic number.

It is an amenable number.

81030889 is a deficient number, since it is larger than the sum of its proper divisors (1).

81030889 is an equidigital number, since it uses as much as digits as its factorization.

81030889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 81030889 is about 9001.7158919841. The cubic root of 81030889 is about 432.7298636666.

The spelling of 81030889 in words is "eighty-one million, thirty thousand, eight hundred eighty-nine".