123131429 has 2 divisors, whose sum is σ = 123131430. Its totient is φ = 123131428.

The previous prime is 123131417. The next prime is 123131483. The reversal of 123131429 is 924131321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93993025 + 29138404 = 9695^2 + 5398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123131429 is a prime.

It is a super-2 number, since 2×123131429² = 30322697615164082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 123131398 and 123131407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123131329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565714 + 61565715.

It is an arithmetic number, because the mean of its divisors is an integer number (61565715).

Almost surely, 2^123131429 is an apocalyptic number.

It is an amenable number.

123131429 is a deficient number, since it is larger than the sum of its proper divisors (1).

123131429 is an equidigital number, since it uses as much as digits as its factorization.

123131429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 123131429 is about 11096.4602013435. The cubic root of 123131429 is about 497.4960534354.

The spelling of 123131429 in words is "one hundred twenty-three million, one hundred thirty-one thousand, four hundred twenty-nine".