123691048502081 has 2 divisors, whose sum is σ = 123691048502082. Its totient is φ = 123691048502080.

The previous prime is 123691048502071. The next prime is 123691048502089. The reversal of 123691048502081 is 180205840196321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85579983393025 + 38111065109056 = 9250945^2 + 6173416^2 .

It is a cyclic number.

It is not a de Polignac number, because 123691048502081 - 2⁴² = 119293001990977 is a prime.

It is a super-2 number, since 2×123691048502081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123691048502089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61845524251040 + 61845524251041.

It is an arithmetic number, because the mean of its divisors is an integer number (61845524251041).

Almost surely, 2^{123691048502081} is an apocalyptic number.

It is an amenable number.

123691048502081 is a deficient number, since it is larger than the sum of its proper divisors (1).

123691048502081 is an equidigital number, since it uses as much as digits as its factorization.

123691048502081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 123691048502081 in words is "one hundred twenty-three trillion, six hundred ninety-one billion, forty-eight million, five hundred two thousand, eighty-one".