81779341 has 8 divisors (see below), whose sum is σ = 94512960. Its totient is φ = 69308448.

The previous prime is 81779323. The next prime is 81779387. The reversal of 81779341 is 14397718.

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-81779341 is a prime.

It is a super-2 number, since 2×81779341² = 13375721228788562, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81779294 and 81779303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81779641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65011 + ... + 66256.

It is an arithmetic number, because the mean of its divisors is an integer number (11814120).

Almost surely, 2^81779341 is an apocalyptic number.

It is an amenable number.

81779341 is a deficient number, since it is larger than the sum of its proper divisors (12733619).

81779341 is a wasteful number, since it uses less digits than its factorization.

81779341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131363.

The product of its digits is 42336, while the sum is 40.

The square root of 81779341 is about 9043.1930754574. The cubic root of 81779341 is about 434.0581038108.

The spelling of 81779341 in words is "eighty-one million, seven hundred seventy-nine thousand, three hundred forty-one".