80781827531 has 4 divisors (see below), whose sum is σ = 80810919912. Its totient is φ = 80752735152.

The previous prime is 80781827507. The next prime is 80781827551. The reversal of 80781827531 is 13572818708.

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 80781827531 - 2¹⁰ = 80781826507 is a prime.

It is a super-2 number, since 2×80781827531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80781827531.

It is not an unprimeable number, because it can be changed into a prime (80781827501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14542025 + ... + 14547578.

It is an arithmetic number, because the mean of its divisors is an integer number (20202729978).

Almost surely, 2^80781827531 is an apocalyptic number.

80781827531 is a deficient number, since it is larger than the sum of its proper divisors (29092381).

80781827531 is a wasteful number, since it uses less digits than its factorization.

80781827531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29092380.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 80781827531 in words is "eighty billion, seven hundred eighty-one million, eight hundred twenty-seven thousand, five hundred thirty-one".