993581213 has 2 divisors, whose sum is σ = 993581214. Its totient is φ = 993581212.

The previous prime is 993581191. The next prime is 993581227. The reversal of 993581213 is 312185399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971132569 + 22448644 = 31163^2 + 4738^2 .

It is a cyclic number.

It is not a de Polignac number, because 993581213 - 2¹⁴ = 993564829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993581233) 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 as a sum of consecutive naturals, namely, 496790606 + 496790607.

It is an arithmetic number, because the mean of its divisors is an integer number (496790607).

Almost surely, 2^993581213 is an apocalyptic number.

It is an amenable number.

993581213 is a deficient number, since it is larger than the sum of its proper divisors (1).

993581213 is an equidigital number, since it uses as much as digits as its factorization.

993581213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 993581213 is about 31521.1232826497. The cubic root of 993581213 is about 997.8558100689.

The spelling of 993581213 in words is "nine hundred ninety-three million, five hundred eighty-one thousand, two hundred thirteen".