81375883 has 2 divisors, whose sum is σ = 81375884. Its totient is φ = 81375882.

The previous prime is 81375851. The next prime is 81375887. The reversal of 81375883 is 38857318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81375883 - 2⁵ = 81375851 is a prime.

It is not a weakly prime, because it can be changed into another prime (81375887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40687941 + 40687942.

It is an arithmetic number, because the mean of its divisors is an integer number (40687942).

Almost surely, 2^81375883 is an apocalyptic number.

81375883 is a deficient number, since it is larger than the sum of its proper divisors (1).

81375883 is an equidigital number, since it uses as much as digits as its factorization.

81375883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 81375883 is about 9020.8582185954. The cubic root of 81375883 is about 433.3431188454.

The spelling of 81375883 in words is "eighty-one million, three hundred seventy-five thousand, eight hundred eighty-three".