80815531 has 4 divisors (see below), whose sum is σ = 85069000. Its totient is φ = 76562064.

The previous prime is 80815519. The next prime is 80815541. The reversal of 80815531 is 13551808.

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 80815531 - 2⁷ = 80815403 is a prime.

It is a super-2 number, since 2×80815531² = 13062300101623922, 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 = 80815493 and 80815502.

It is not an unprimeable number, because it can be changed into a prime (80815541) 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 3 ways as a sum of consecutive naturals, for example, 2126706 + ... + 2126743.

It is an arithmetic number, because the mean of its divisors is an integer number (21267250).

Almost surely, 2^80815531 is an apocalyptic number.

80815531 is a deficient number, since it is larger than the sum of its proper divisors (4253469).

80815531 is a wasteful number, since it uses less digits than its factorization.

80815531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4253468.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 80815531 is about 8989.7458807243. The cubic root of 80815531 is about 432.3461642291.

The spelling of 80815531 in words is "eighty million, eight hundred fifteen thousand, five hundred thirty-one".