123121131277 has 2 divisors, whose sum is σ = 123121131278. Its totient is φ = 123121131276.

The previous prime is 123121131269. The next prime is 123121131359. The reversal of 123121131277 is 772131121321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122090143396 + 1030987881 = 349414^2 + 32109^2 .

It is a cyclic number.

It is not a de Polignac number, because 123121131277 - 2³ = 123121131269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123121131257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560565638 + 61560565639.

It is an arithmetic number, because the mean of its divisors is an integer number (61560565639).

Almost surely, 2^123121131277 is an apocalyptic number.

It is an amenable number.

123121131277 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121131277 is an equidigital number, since it uses as much as digits as its factorization.

123121131277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

Adding to 123121131277 its reverse (772131121321), we get a palindrome (895252252598).

The spelling of 123121131277 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred seventy-seven".