1231203131 has 2 divisors, whose sum is σ = 1231203132. Its totient is φ = 1231203130.

The previous prime is 1231203079. The next prime is 1231203137. The reversal of 1231203131 is 1313021321.

It is a strong prime.

It is an emirp because it is prime and its reverse (1313021321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231203131 - 2⁶ = 1231203067 is a prime.

It is a super-2 number, since 2×1231203131² = 3031722299568406322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1231203137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615601565 + 615601566.

It is an arithmetic number, because the mean of its divisors is an integer number (615601566).

Almost surely, 2^1231203131 is an apocalyptic number.

1231203131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231203131 is an equidigital number, since it uses as much as digits as its factorization.

1231203131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1231203131 is about 35088.5042570925. The cubic root of 1231203131 is about 1071.7905011613.

Adding to 1231203131 its reverse (1313021321), we get a palindrome (2544224452).

The spelling of 1231203131 in words is "one billion, two hundred thirty-one million, two hundred three thousand, one hundred thirty-one".