123020841157 has 2 divisors, whose sum is σ = 123020841158. Its totient is φ = 123020841156.

The previous prime is 123020841137. The next prime is 123020841179. The reversal of 123020841157 is 751148020321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78347368836 + 44673472321 = 279906^2 + 211361^2 .

It is a cyclic number.

It is not a de Polignac number, because 123020841157 - 2²⁷ = 122886623429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123020841137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510420578 + 61510420579.

It is an arithmetic number, because the mean of its divisors is an integer number (61510420579).

Almost surely, 2^123020841157 is an apocalyptic number.

It is an amenable number.

123020841157 is a deficient number, since it is larger than the sum of its proper divisors (1).

123020841157 is an equidigital number, since it uses as much as digits as its factorization.

123020841157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 123020841157 its reverse (751148020321), we get a palindrome (874168861478).

The spelling of 123020841157 in words is "one hundred twenty-three billion, twenty million, eight hundred forty-one thousand, one hundred fifty-seven".