81484551019 has 2 divisors, whose sum is σ = 81484551020. Its totient is φ = 81484551018.

The previous prime is 81484551007. The next prime is 81484551097. The reversal of 81484551019 is 91015548418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81484551019 - 2²¹ = 81482453867 is a prime.

It is a super-2 number, since 2×81484551019² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81484551019.

It is not a weakly prime, because it can be changed into another prime (81484551719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40742275509 + 40742275510.

It is an arithmetic number, because the mean of its divisors is an integer number (40742275510).

Almost surely, 2^81484551019 is an apocalyptic number.

81484551019 is a deficient number, since it is larger than the sum of its proper divisors (1).

81484551019 is an equidigital number, since it uses as much as digits as its factorization.

81484551019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 46.

The spelling of 81484551019 in words is "eighty-one billion, four hundred eighty-four million, five hundred fifty-one thousand, nineteen".