2135391079691 has 2 divisors, whose sum is σ = 2135391079692. Its totient is φ = 2135391079690.

The previous prime is 2135391079687. The next prime is 2135391079709. The reversal of 2135391079691 is 1969701935312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2135391079691 - 2² = 2135391079687 is a prime.

It is not a weakly prime, because it can be changed into another prime (2135391079091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067695539845 + 1067695539846.

It is an arithmetic number, because the mean of its divisors is an integer number (1067695539846).

Almost surely, 2^{2135391079691} is an apocalyptic number.

2135391079691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135391079691 is an equidigital number, since it uses as much as digits as its factorization.

2135391079691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2755620, while the sum is 56.

The spelling of 2135391079691 in words is "two trillion, one hundred thirty-five billion, three hundred ninety-one million, seventy-nine thousand, six hundred ninety-one".