291968396381 has 2 divisors, whose sum is σ = 291968396382. Its totient is φ = 291968396380.

The previous prime is 291968396341. The next prime is 291968396383. The reversal of 291968396381 is 183693869192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291968396281 + 100 = 540341^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291968396381 is a prime.

It is a super-2 number, since 2×291968396381² (a number of 24 digits) contains 22 as substring.

Together with 291968396383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291968396383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145984198190 + 145984198191.

It is an arithmetic number, because the mean of its divisors is an integer number (145984198191).

Almost surely, 2^291968396381 is an apocalyptic number.

It is an amenable number.

291968396381 is a deficient number, since it is larger than the sum of its proper divisors (1).

291968396381 is an equidigital number, since it uses as much as digits as its factorization.

291968396381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30233088, while the sum is 65.

The spelling of 291968396381 in words is "two hundred ninety-one billion, nine hundred sixty-eight million, three hundred ninety-six thousand, three hundred eighty-one".