811975212 has 96 divisors (see below), whose sum is σ = 2172219840. Its totient is φ = 262103040.

The previous prime is 811975201. The next prime is 811975253. The reversal of 811975212 is 212579118.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

811975212 is a Rhonda number in base 10.

Its product of digits (10080) is a multiple of the sum of its prime factors (1008).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1266412 + ... + 1267052.

It is an arithmetic number, because the mean of its divisors is an integer number (22627290).

Almost surely, 2^811975212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811975212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086109920).

811975212 is an abundant number, since it is smaller than the sum of its proper divisors (1360244628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811975212 is a wasteful number, since it uses less digits than its factorization.

811975212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008 (or 1000 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 811975212 is about 28495.1787500974. The cubic root of 811975212 is about 932.9268457237.

The spelling of 811975212 in words is "eight hundred eleven million, nine hundred seventy-five thousand, two hundred twelve".