822013981 has 4 divisors (see below), whose sum is σ = 825542172. Its totient is φ = 818485792.

The previous prime is 822013943. The next prime is 822013999. The reversal of 822013981 is 189310228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56385081 + 765628900 = 7509^2 + 27670^2 .

It is a cyclic number.

It is not a de Polignac number, because 822013981 - 2¹⁷ = 821882909 is a prime.

It is a super-2 number, since 2×822013981² = 1351413969918936722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822013921) 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 3 ways as a sum of consecutive naturals, for example, 1763746 + ... + 1764211.

It is an arithmetic number, because the mean of its divisors is an integer number (206385543).

Almost surely, 2^822013981 is an apocalyptic number.

It is an amenable number.

822013981 is a deficient number, since it is larger than the sum of its proper divisors (3528191).

822013981 is a wasteful number, since it uses less digits than its factorization.

822013981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528190.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 822013981 is about 28670.7861943128. The cubic root of 822013981 is about 936.7558229717.

It can be divided in two parts, 8220 and 13981, that added together give a square (22201 = 149²).

The spelling of 822013981 in words is "eight hundred twenty-two million, thirteen thousand, nine hundred eighty-one".