81074182379 has 2 divisors, whose sum is σ = 81074182380. Its totient is φ = 81074182378.

The previous prime is 81074182349. The next prime is 81074182391. The reversal of 81074182379 is 97328147018.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81074182379 is a prime.

It is not a weakly prime, because it can be changed into another prime (81074182349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40537091189 + 40537091190.

It is an arithmetic number, because the mean of its divisors is an integer number (40537091190).

Almost surely, 2^81074182379 is an apocalyptic number.

81074182379 is a deficient number, since it is larger than the sum of its proper divisors (1).

81074182379 is an equidigital number, since it uses as much as digits as its factorization.

81074182379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 81074182379 in words is "eighty-one billion, seventy-four million, one hundred eighty-two thousand, three hundred seventy-nine".