81037979 has 8 divisors (see below), whose sum is σ = 88510320. Its totient is φ = 73583200.

The previous prime is 81037897. The next prime is 81037981. The reversal of 81037979 is 97973018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81037979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81034979) 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 7 ways as a sum of consecutive naturals, for example, 6437 + ... + 14265.

It is an arithmetic number, because the mean of its divisors is an integer number (11063790).

Almost surely, 2^81037979 is an apocalyptic number.

81037979 is a deficient number, since it is larger than the sum of its proper divisors (7472341).

81037979 is a wasteful number, since it uses less digits than its factorization.

81037979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8781.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 81037979 is about 9002.1096971765. The cubic root of 81037979 is about 432.7424842252.

The spelling of 81037979 in words is "eighty-one million, thirty-seven thousand, nine hundred seventy-nine".