81039641519 has 2 divisors, whose sum is σ = 81039641520. Its totient is φ = 81039641518.

The previous prime is 81039641483. The next prime is 81039641533. The reversal of 81039641519 is 91514693018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81039641519 - 2¹⁶ = 81039575983 is a prime.

It is a super-2 number, since 2×81039641519² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81039641539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40519820759 + 40519820760.

It is an arithmetic number, because the mean of its divisors is an integer number (40519820760).

Almost surely, 2^81039641519 is an apocalyptic number.

81039641519 is a deficient number, since it is larger than the sum of its proper divisors (1).

81039641519 is an equidigital number, since it uses as much as digits as its factorization.

81039641519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 81039641519 in words is "eighty-one billion, thirty-nine million, six hundred forty-one thousand, five hundred nineteen".