123131277 has 6 divisors (see below), whose sum is σ = 177856302. Its totient is φ = 82087512.

The previous prime is 123131273. The next prime is 123131279. The reversal of 123131277 is 772131321.

It can be written as a sum of positive squares in only one way, i.e., 76632516 + 46498761 = 8754^2 + 6819^2 .

It is not a de Polignac number, because 123131277 - 2² = 123131273 is a prime.

It is a super-2 number, since 2×123131277² = 30322622751301458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123131277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6840618 + ... + 6840635.

It is an arithmetic number, because the mean of its divisors is an integer number (29642717).

Almost surely, 2^123131277 is an apocalyptic number.

It is an amenable number.

123131277 is a deficient number, since it is larger than the sum of its proper divisors (54725025).

123131277 is a wasteful number, since it uses less digits than its factorization.

123131277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13681259 (or 13681256 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 123131277 is about 11096.4533523104. The cubic root of 123131277 is about 497.4958487234.

Adding to 123131277 its reverse (772131321), we get a palindrome (895262598).

The spelling of 123131277 in words is "one hundred twenty-three million, one hundred thirty-one thousand, two hundred seventy-seven".