80631021 has 4 divisors (see below), whose sum is σ = 107508032. Its totient is φ = 53754012.

The previous prime is 80631013. The next prime is 80631043. The reversal of 80631021 is 12013608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 80631021 - 2³ = 80631013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80631011) 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, 13438501 + ... + 13438506.

It is an arithmetic number, because the mean of its divisors is an integer number (26877008).

Almost surely, 2^80631021 is an apocalyptic number.

It is an amenable number.

80631021 is a deficient number, since it is larger than the sum of its proper divisors (26877011).

80631021 is a wasteful number, since it uses less digits than its factorization.

80631021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26877010.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 80631021 is about 8979.4777687792. The cubic root of 80631021 is about 432.0168835565.

Adding to 80631021 its reverse (12013608), we get a palindrome (92644629).

The spelling of 80631021 in words is "eighty million, six hundred thirty-one thousand, twenty-one".