81043377419 has 2 divisors, whose sum is σ = 81043377420. Its totient is φ = 81043377418.

The previous prime is 81043377397. The next prime is 81043377479. The reversal of 81043377419 is 91477334018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81043377419 - 2¹⁶ = 81043311883 is a prime.

It is a super-2 number, since 2×81043377419² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81043377479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40521688709 + 40521688710.

It is an arithmetic number, because the mean of its divisors is an integer number (40521688710).

Almost surely, 2^81043377419 is an apocalyptic number.

81043377419 is a deficient number, since it is larger than the sum of its proper divisors (1).

81043377419 is an equidigital number, since it uses as much as digits as its factorization.

81043377419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 81043377419 in words is "eighty-one billion, forty-three million, three hundred seventy-seven thousand, four hundred nineteen".