81112379 has 2 divisors, whose sum is σ = 81112380. Its totient is φ = 81112378.

The previous prime is 81112363. The next prime is 81112403. The reversal of 81112379 is 97321118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81112379 - 2⁴ = 81112363 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81112279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40556189 + 40556190.

It is an arithmetic number, because the mean of its divisors is an integer number (40556190).

Almost surely, 2^81112379 is an apocalyptic number.

81112379 is a deficient number, since it is larger than the sum of its proper divisors (1).

81112379 is an equidigital number, since it uses as much as digits as its factorization.

81112379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 81112379 is about 9006.2411138055. The cubic root of 81112379 is about 432.8748756188.

The spelling of 81112379 in words is "eighty-one million, one hundred twelve thousand, three hundred seventy-nine".