81387083 has 2 divisors, whose sum is σ = 81387084. Its totient is φ = 81387082.

The previous prime is 81387077. The next prime is 81387101. The reversal of 81387083 is 38078318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81387083 - 2⁴ = 81387067 is a prime.

It is not a weakly prime, because it can be changed into another prime (81387983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40693541 + 40693542.

It is an arithmetic number, because the mean of its divisors is an integer number (40693542).

Almost surely, 2^81387083 is an apocalyptic number.

81387083 is a deficient number, since it is larger than the sum of its proper divisors (1).

81387083 is an equidigital number, since it uses as much as digits as its factorization.

81387083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 81387083 is about 9021.4789807437. The cubic root of 81387083 is about 433.3629986923.

The spelling of 81387083 in words is "eighty-one million, three hundred eighty-seven thousand, eighty-three".