81458983 has 2 divisors, whose sum is σ = 81458984. Its totient is φ = 81458982.

The previous prime is 81458969. The next prime is 81458987. The reversal of 81458983 is 38985418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81458983 - 2⁹ = 81458471 is a prime.

It is a super-2 number, since 2×81458983² = 13271131822788578, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81458987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40729491 + 40729492.

It is an arithmetic number, because the mean of its divisors is an integer number (40729492).

Almost surely, 2^81458983 is an apocalyptic number.

81458983 is a deficient number, since it is larger than the sum of its proper divisors (1).

81458983 is an equidigital number, since it uses as much as digits as its factorization.

81458983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 81458983 is about 9025.4630352132. The cubic root of 81458983 is about 433.4905767935.

The spelling of 81458983 in words is "eighty-one million, four hundred fifty-eight thousand, nine hundred eighty-three".