1231303123 has 2 divisors, whose sum is σ = 1231303124. Its totient is φ = 1231303122.

The previous prime is 1231303079. The next prime is 1231303127. The reversal of 1231303123 is 3213031321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231303123 is a prime.

It is a super-2 number, since 2×1231303123² = 3032214761419106258, 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 1231303123.

It is not a weakly prime, because it can be changed into another prime (1231303127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615651561 + 615651562.

It is an arithmetic number, because the mean of its divisors is an integer number (615651562).

Almost surely, 2^1231303123 is an apocalyptic number.

1231303123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231303123 is an equidigital number, since it uses as much as digits as its factorization.

1231303123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1231303123 is about 35089.9290822880. The cubic root of 1231303123 is about 1071.8195154840.

Adding to 1231303123 its reverse (3213031321), we get a palindrome (4444334444).

It can be divided in two parts, 123130 and 3123, that added together give a triangular number (126253 = T₅₀₂).

The spelling of 1231303123 in words is "one billion, two hundred thirty-one million, three hundred three thousand, one hundred twenty-three".