291864043879 has 2 divisors, whose sum is σ = 291864043880. Its totient is φ = 291864043878.

The previous prime is 291864043781. The next prime is 291864043903. The reversal of 291864043879 is 978340468192.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 291864043879 - 2¹⁷ = 291863912807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291864046879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145932021939 + 145932021940.

It is an arithmetic number, because the mean of its divisors is an integer number (145932021940).

Almost surely, 2^291864043879 is an apocalyptic number.

291864043879 is a deficient number, since it is larger than the sum of its proper divisors (1).

291864043879 is an equidigital number, since it uses as much as digits as its factorization.

291864043879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 291864043879 in words is "two hundred ninety-one billion, eight hundred sixty-four million, forty-three thousand, eight hundred seventy-nine".