1231376213 has 2 divisors, whose sum is σ = 1231376214. Its totient is φ = 1231376212.

The previous prime is 1231376207. The next prime is 1231376219. The reversal of 1231376213 is 3126731321.

It is a balanced prime because it is at equal distance from previous prime (1231376207) and next prime (1231376219).

It can be written as a sum of positive squares in only one way, i.e., 784392049 + 446984164 = 28007^2 + 21142^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231376213 - 2¹² = 1231372117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231376219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615688106 + 615688107.

It is an arithmetic number, because the mean of its divisors is an integer number (615688107).

Almost surely, 2^1231376213 is an apocalyptic number.

It is an amenable number.

1231376213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231376213 is an equidigital number, since it uses as much as digits as its factorization.

1231376213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 29.

The square root of 1231376213 is about 35090.9705337427. The cubic root of 1231376213 is about 1071.8407227553.

The spelling of 1231376213 in words is "one billion, two hundred thirty-one million, three hundred seventy-six thousand, two hundred thirteen".