81413219 has 2 divisors, whose sum is σ = 81413220. Its totient is φ = 81413218.

The previous prime is 81413207. The next prime is 81413303. The reversal of 81413219 is 91231418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81413219 - 2⁴ = 81413203 is a prime.

It is a super-2 number, since 2×81413219² = 13256224455883922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_4747223 and since 81413219 and 4747223 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 81413191 and 81413200.

It is not a weakly prime, because it can be changed into another prime (81413419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40706609 + 40706610.

It is an arithmetic number, because the mean of its divisors is an integer number (40706610).

Almost surely, 2^81413219 is an apocalyptic number.

81413219 is a deficient number, since it is larger than the sum of its proper divisors (1).

81413219 is an equidigital number, since it uses as much as digits as its factorization.

81413219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 81413219 is about 9022.9274074438. The cubic root of 81413219 is about 433.4093826422.

The spelling of 81413219 in words is "eighty-one million, four hundred thirteen thousand, two hundred nineteen".