123534540091 has 2 divisors, whose sum is σ = 123534540092. Its totient is φ = 123534540090.

The previous prime is 123534540071. The next prime is 123534540211. The reversal of 123534540091 is 190045435321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123534540091 - 2⁷ = 123534539963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123534540091.

It is not a weakly prime, because it can be changed into another prime (123534540071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61767270045 + 61767270046.

It is an arithmetic number, because the mean of its divisors is an integer number (61767270046).

Almost surely, 2^123534540091 is an apocalyptic number.

123534540091 is a deficient number, since it is larger than the sum of its proper divisors (1).

123534540091 is an equidigital number, since it uses as much as digits as its factorization.

123534540091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 123534540091 in words is "one hundred twenty-three billion, five hundred thirty-four million, five hundred forty thousand, ninety-one".