81341563 has 2 divisors, whose sum is σ = 81341564. Its totient is φ = 81341562.

The previous prime is 81341539. The next prime is 81341567. The reversal of 81341563 is 36514318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81341563 - 2⁵ = 81341531 is a prime.

It is not a weakly prime, because it can be changed into another prime (81341567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40670781 + 40670782.

It is an arithmetic number, because the mean of its divisors is an integer number (40670782).

Almost surely, 2^81341563 is an apocalyptic number.

81341563 is a deficient number, since it is larger than the sum of its proper divisors (1).

81341563 is an equidigital number, since it uses as much as digits as its factorization.

81341563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 81341563 is about 9018.9557599536. The cubic root of 81341563 is about 433.2821899536.

The spelling of 81341563 in words is "eighty-one million, three hundred forty-one thousand, five hundred sixty-three".