391105060691 has 2 divisors, whose sum is σ = 391105060692. Its totient is φ = 391105060690.

The previous prime is 391105060609. The next prime is 391105060721. The reversal of 391105060691 is 196060501193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391105060691 - 2¹⁸ = 391104798547 is a prime.

It is a super-2 number, since 2×391105060691² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (391105560691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195552530345 + 195552530346.

It is an arithmetic number, because the mean of its divisors is an integer number (195552530346).

Almost surely, 2^391105060691 is an apocalyptic number.

391105060691 is a deficient number, since it is larger than the sum of its proper divisors (1).

391105060691 is an equidigital number, since it uses as much as digits as its factorization.

391105060691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 41.

The spelling of 391105060691 in words is "three hundred ninety-one billion, one hundred five million, sixty thousand, six hundred ninety-one".