993212861 has 2 divisors, whose sum is σ = 993212862. Its totient is φ = 993212860.

The previous prime is 993212807. The next prime is 993212893. The reversal of 993212861 is 168212399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 860248900 + 132963961 = 29330^2 + 11531^2 .

It is a cyclic number.

It is not a de Polignac number, because 993212861 - 2¹⁰ = 993211837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_50519948 and since 993212861 and 50519948 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993211861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496606430 + 496606431.

It is an arithmetic number, because the mean of its divisors is an integer number (496606431).

Almost surely, 2^993212861 is an apocalyptic number.

It is an amenable number.

993212861 is a deficient number, since it is larger than the sum of its proper divisors (1).

993212861 is an equidigital number, since it uses as much as digits as its factorization.

993212861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 993212861 is about 31515.2798020262. The cubic root of 993212861 is about 997.7324825844.

The spelling of 993212861 in words is "nine hundred ninety-three million, two hundred twelve thousand, eight hundred sixty-one".