812180987 has 6 divisors (see below), whose sum is σ = 813984444. Its totient is φ = 810380340.

The previous prime is 812180983. The next prime is 812181089. The reversal of 812180987 is 789081218.

It is not a de Polignac number, because 812180987 - 2² = 812180983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812180983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 819062 + ... + 820052.

It is an arithmetic number, because the mean of its divisors is an integer number (135664074).

Almost surely, 2^812180987 is an apocalyptic number.

812180987 is a deficient number, since it is larger than the sum of its proper divisors (1803457).

812180987 is an frugal number, since it uses more digits than its factorization.

812180987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 812180987 is about 28498.7892198949. The cubic root of 812180987 is about 933.0056481321.

The spelling of 812180987 in words is "eight hundred twelve million, one hundred eighty thousand, nine hundred eighty-seven".