82991443 has 2 divisors, whose sum is σ = 82991444. Its totient is φ = 82991442.

The previous prime is 82991431. The next prime is 82991453. The reversal of 82991443 is 34419928.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82991443 - 2⁹ = 82990931 is a prime.

It is a super-2 number, since 2×82991443² = 13775159222444498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 82991396 and 82991405.

It is not a weakly prime, because it can be changed into another prime (82991413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41495721 + 41495722.

It is an arithmetic number, because the mean of its divisors is an integer number (41495722).

Almost surely, 2^82991443 is an apocalyptic number.

82991443 is a deficient number, since it is larger than the sum of its proper divisors (1).

82991443 is an equidigital number, since it uses as much as digits as its factorization.

82991443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 82991443 is about 9109.9639406531. The cubic root of 82991443 is about 436.1920761730.

The spelling of 82991443 in words is "eighty-two million, nine hundred ninety-one thousand, four hundred forty-three".