81833419 has 2 divisors, whose sum is σ = 81833420. Its totient is φ = 81833418.

The previous prime is 81833387. The next prime is 81833443. The reversal of 81833419 is 91433818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81833419 - 2⁵ = 81833387 is a prime.

It is a super-2 number, since 2×81833419² = 13393416930459122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81833449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40916709 + 40916710.

It is an arithmetic number, because the mean of its divisors is an integer number (40916710).

Almost surely, 2^81833419 is an apocalyptic number.

81833419 is a deficient number, since it is larger than the sum of its proper divisors (1).

81833419 is an equidigital number, since it uses as much as digits as its factorization.

81833419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 81833419 is about 9046.1825650381. The cubic root of 81833419 is about 434.1537588658.

The spelling of 81833419 in words is "eighty-one million, eight hundred thirty-three thousand, four hundred nineteen".