821312692 has 6 divisors (see below), whose sum is σ = 1437297218. Its totient is φ = 410656344.

The previous prime is 821312689. The next prime is 821312693. The reversal of 821312692 is 296213128.

821312692 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 426257316 + 395055376 = 20646^2 + 19876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821312693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102664083 + ... + 102664090.

Almost surely, 2^821312692 is an apocalyptic number.

It is an amenable number.

821312692 is a deficient number, since it is larger than the sum of its proper divisors (615984526).

821312692 is a wasteful number, since it uses less digits than its factorization.

821312692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205328177 (or 205328175 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 821312692 is about 28658.5535573588. The cubic root of 821312692 is about 936.4893540808.

The spelling of 821312692 in words is "eight hundred twenty-one million, three hundred twelve thousand, six hundred ninety-two".