81046379 has 2 divisors, whose sum is σ = 81046380. Its totient is φ = 81046378.

The previous prime is 81046363. The next prime is 81046397. The reversal of 81046379 is 97364018.

Together with next prime (81046397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81046379 - 2⁴ = 81046363 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81046579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40523189 + 40523190.

It is an arithmetic number, because the mean of its divisors is an integer number (40523190).

Almost surely, 2^81046379 is an apocalyptic number.

81046379 is a deficient number, since it is larger than the sum of its proper divisors (1).

81046379 is an equidigital number, since it uses as much as digits as its factorization.

81046379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 81046379 is about 9002.5762423875. The cubic root of 81046379 is about 432.7574356974.

The spelling of 81046379 in words is "eighty-one million, forty-six thousand, three hundred seventy-nine".