1155026242691 has 2 divisors, whose sum is σ = 1155026242692. Its totient is φ = 1155026242690.

The previous prime is 1155026242619. The next prime is 1155026242757. The reversal of 1155026242691 is 1962426205511.

Together with previous prime (1155026242619) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (1962426205511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155026242691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155026242991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577513121345 + 577513121346.

It is an arithmetic number, because the mean of its divisors is an integer number (577513121346).

Almost surely, 2^{1155026242691} is an apocalyptic number.

1155026242691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155026242691 is an equidigital number, since it uses as much as digits as its factorization.

1155026242691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 1155026242691 in words is "one trillion, one hundred fifty-five billion, twenty-six million, two hundred forty-two thousand, six hundred ninety-one".