81083987 has 2 divisors, whose sum is σ = 81083988. Its totient is φ = 81083986.

The previous prime is 81083953. The next prime is 81084037. The reversal of 81083987 is 78938018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81083987 - 2⁶ = 81083923 is a prime.

It is a super-2 number, since 2×81083987² = 13149225895632338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81083927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40541993 + 40541994.

It is an arithmetic number, because the mean of its divisors is an integer number (40541994).

Almost surely, 2^81083987 is an apocalyptic number.

81083987 is a deficient number, since it is larger than the sum of its proper divisors (1).

81083987 is an equidigital number, since it uses as much as digits as its factorization.

81083987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 81083987 is about 9004.6647355690. The cubic root of 81083987 is about 432.8243629108.

The spelling of 81083987 in words is "eighty-one million, eighty-three thousand, nine hundred eighty-seven".