81119849 has 2 divisors, whose sum is σ = 81119850. Its totient is φ = 81119848.

The previous prime is 81119821. The next prime is 81119861. The reversal of 81119849 is 94891118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43824400 + 37295449 = 6620^2 + 6107^2 .

It is a cyclic number.

It is not a de Polignac number, because 81119849 - 2⁸ = 81119593 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (81119449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40559924 + 40559925.

It is an arithmetic number, because the mean of its divisors is an integer number (40559925).

Almost surely, 2^81119849 is an apocalyptic number.

It is an amenable number.

81119849 is a deficient number, since it is larger than the sum of its proper divisors (1).

81119849 is an equidigital number, since it uses as much as digits as its factorization.

81119849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 41.

The square root of 81119849 is about 9006.6558166725. The cubic root of 81119849 is about 432.8881636689. Note that the first 3 decimals are identical.

The spelling of 81119849 in words is "eighty-one million, one hundred nineteen thousand, eight hundred forty-nine".