80681831 has 4 divisors (see below), whose sum is σ = 81703200. Its totient is φ = 79660464.

The previous prime is 80681827. The next prime is 80681873. The reversal of 80681831 is 13818608.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80681831 - 2² = 80681827 is a prime.

It is a super-2 number, since 2×80681831² = 13019115707025122, 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 = 80681791 and 80681800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80681431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510566 + ... + 510723.

It is an arithmetic number, because the mean of its divisors is an integer number (20425800).

Almost surely, 2^80681831 is an apocalyptic number.

80681831 is a deficient number, since it is larger than the sum of its proper divisors (1021369).

80681831 is a wasteful number, since it uses less digits than its factorization.

80681831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021368.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 80681831 is about 8982.3065523283. The cubic root of 80681831 is about 432.1076102950.

The spelling of 80681831 in words is "eighty million, six hundred eighty-one thousand, eight hundred thirty-one".