123895740691 has 2 divisors, whose sum is σ = 123895740692. Its totient is φ = 123895740690.

The previous prime is 123895740679. The next prime is 123895740739. The reversal of 123895740691 is 196047598321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123895740691 - 2²⁹ = 123358869779 is a prime.

It is a super-2 number, since 2×123895740691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123895740191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61947870345 + 61947870346.

It is an arithmetic number, because the mean of its divisors is an integer number (61947870346).

It is a 1-persistent number, because it is pandigital, but 2⋅123895740691 = 247791481382 is not.

Almost surely, 2^123895740691 is an apocalyptic number.

123895740691 is a deficient number, since it is larger than the sum of its proper divisors (1).

123895740691 is an equidigital number, since it uses as much as digits as its factorization.

123895740691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 123895740691 in words is "one hundred twenty-three billion, eight hundred ninety-five million, seven hundred forty thousand, six hundred ninety-one".