861333013 has 2 divisors, whose sum is σ = 861333014. Its totient is φ = 861333012.

The previous prime is 861333001. The next prime is 861333019. The reversal of 861333013 is 310333168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668067409 + 193265604 = 25847^2 + 13902^2 .

It is a cyclic number.

It is not a de Polignac number, because 861333013 - 2⁵ = 861332981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861333019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430666506 + 430666507.

It is an arithmetic number, because the mean of its divisors is an integer number (430666507).

Almost surely, 2^861333013 is an apocalyptic number.

It is an amenable number.

861333013 is a deficient number, since it is larger than the sum of its proper divisors (1).

861333013 is an equidigital number, since it uses as much as digits as its factorization.

861333013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 861333013 is about 29348.4754799973. The cubic root of 861333013 is about 951.4596262015.

The spelling of 861333013 in words is "eight hundred sixty-one million, three hundred thirty-three thousand, thirteen".