80631813 has 16 divisors (see below), whose sum is σ = 114028416. Its totient is φ = 50571840.

The previous prime is 80631809. The next prime is 80631821. The reversal of 80631813 is 31813608.

It is not a de Polignac number, because 80631813 - 2² = 80631809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80631823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5370 + ... + 13787.

It is an arithmetic number, because the mean of its divisors is an integer number (7126776).

Almost surely, 2^80631813 is an apocalyptic number.

It is an amenable number.

80631813 is a deficient number, since it is larger than the sum of its proper divisors (33396603).

80631813 is a wasteful number, since it uses less digits than its factorization.

80631813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19244.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 80631813 is about 8979.5218692311. The cubic root of 80631813 is about 432.0182980504.

The spelling of 80631813 in words is "eighty million, six hundred thirty-one thousand, eight hundred thirteen".