81119237 has 2 divisors, whose sum is σ = 81119238. Its totient is φ = 81119236.

The previous prime is 81119221. The next prime is 81119267. The reversal of 81119237 is 73291118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59459521 + 21659716 = 7711^2 + 4654^2 .

It is a cyclic number.

It is not a de Polignac number, because 81119237 - 2⁴ = 81119221 is a prime.

It is a super-2 number, since 2×81119237² = 13160661222924338, 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 (81119267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40559618 + 40559619.

It is an arithmetic number, because the mean of its divisors is an integer number (40559619).

Almost surely, 2^81119237 is an apocalyptic number.

It is an amenable number.

81119237 is a deficient number, since it is larger than the sum of its proper divisors (1).

81119237 is an equidigital number, since it uses as much as digits as its factorization.

81119237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 81119237 is about 9006.6218417340. The cubic root of 81119237 is about 432.8870750400.

The spelling of 81119237 in words is "eighty-one million, one hundred nineteen thousand, two hundred thirty-seven".