81351883 has 2 divisors, whose sum is σ = 81351884. Its totient is φ = 81351882.

The previous prime is 81351847. The next prime is 81351899. The reversal of 81351883 is 38815318.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81351883 is a prime.

It is not a weakly prime, because it can be changed into another prime (81351983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40675941 + 40675942.

It is an arithmetic number, because the mean of its divisors is an integer number (40675942).

Almost surely, 2^81351883 is an apocalyptic number.

81351883 is a deficient number, since it is larger than the sum of its proper divisors (1).

81351883 is an equidigital number, since it uses as much as digits as its factorization.

81351883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 81351883 is about 9019.5278701271. The cubic root of 81351883 is about 433.3005130304.

The spelling of 81351883 in words is "eighty-one million, three hundred fifty-one thousand, eight hundred eighty-three".