1231313071 has 2 divisors, whose sum is σ = 1231313072. Its totient is φ = 1231313070.

The previous prime is 1231313063. The next prime is 1231313081. The reversal of 1231313071 is 1703131321.

It is a weak prime.

It is an emirp because it is prime and its reverse (1703131321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231313071 - 2³ = 1231313063 is a prime.

It is a super-2 number, since 2×1231313071² = 3032263757630902082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231313081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615656535 + 615656536.

It is an arithmetic number, because the mean of its divisors is an integer number (615656536).

Almost surely, 2^1231313071 is an apocalyptic number.

1231313071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231313071 is an equidigital number, since it uses as much as digits as its factorization.

1231313071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 1231313071 is about 35090.0708320744. The cubic root of 1231313071 is about 1071.8224019738.

Adding to 1231313071 its reverse (1703131321), we get a palindrome (2934444392).

The spelling of 1231313071 in words is "one billion, two hundred thirty-one million, three hundred thirteen thousand, seventy-one".