291918643213 has 2 divisors, whose sum is σ = 291918643214. Its totient is φ = 291918643212.

The previous prime is 291918643201. The next prime is 291918643217. The reversal of 291918643213 is 312346819192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239318596804 + 52600046409 = 489202^2 + 229347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291918643213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291918643217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145959321606 + 145959321607.

It is an arithmetic number, because the mean of its divisors is an integer number (145959321607).

Almost surely, 2^291918643213 is an apocalyptic number.

It is an amenable number.

291918643213 is a deficient number, since it is larger than the sum of its proper divisors (1).

291918643213 is an equidigital number, since it uses as much as digits as its factorization.

291918643213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The spelling of 291918643213 in words is "two hundred ninety-one billion, nine hundred eighteen million, six hundred forty-three thousand, two hundred thirteen".