821283373 has 2 divisors, whose sum is σ = 821283374. Its totient is φ = 821283372.

The previous prime is 821283349. The next prime is 821283377. The reversal of 821283373 is 373382128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820077769 + 1205604 = 28637^2 + 1098^2 .

It is a cyclic number.

It is not a de Polignac number, because 821283373 - 2¹⁷ = 821152301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821283377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410641686 + 410641687.

It is an arithmetic number, because the mean of its divisors is an integer number (410641687).

Almost surely, 2^821283373 is an apocalyptic number.

It is an amenable number.

821283373 is a deficient number, since it is larger than the sum of its proper divisors (1).

821283373 is an equidigital number, since it uses as much as digits as its factorization.

821283373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 821283373 is about 28658.0420301178. The cubic root of 821283373 is about 936.4782104330.

The spelling of 821283373 in words is "eight hundred twenty-one million, two hundred eighty-three thousand, three hundred seventy-three".