81053379 has 24 divisors (see below), whose sum is σ = 132455232. Its totient is φ = 49121640.

The previous prime is 81053363. The next prime is 81053383. The reversal of 81053379 is 97335018.

It is not a de Polignac number, because 81053379 - 2⁴ = 81053363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81053309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12489 + ... + 17834.

It is an arithmetic number, because the mean of its divisors is an integer number (5518968).

Almost surely, 2^81053379 is an apocalyptic number.

81053379 is a deficient number, since it is larger than the sum of its proper divisors (51401853).

81053379 is a wasteful number, since it uses less digits than its factorization.

81053379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30349 (or 30337 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 81053379 is about 9002.9650115948. The cubic root of 81053379 is about 432.7698944685.

The spelling of 81053379 in words is "eighty-one million, fifty-three thousand, three hundred seventy-nine".