81015383 has 2 divisors, whose sum is σ = 81015384. Its totient is φ = 81015382.

The previous prime is 81015377. The next prime is 81015409. The reversal of 81015383 is 38351018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81015383 - 2²⁰ = 79966807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81015313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40507691 + 40507692.

It is an arithmetic number, because the mean of its divisors is an integer number (40507692).

Almost surely, 2^81015383 is an apocalyptic number.

81015383 is a deficient number, since it is larger than the sum of its proper divisors (1).

81015383 is an equidigital number, since it uses as much as digits as its factorization.

81015383 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81015383 is about 9000.8545705394. The cubic root of 81015383 is about 432.7022596364.

The spelling of 81015383 in words is "eighty-one million, fifteen thousand, three hundred eighty-three".