1231245311 has 2 divisors, whose sum is σ = 1231245312. Its totient is φ = 1231245310.

The previous prime is 1231245299. The next prime is 1231245317. The reversal of 1231245311 is 1135421321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231245311 - 2¹⁸ = 1230983167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231245317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615622655 + 615622656.

It is an arithmetic number, because the mean of its divisors is an integer number (615622656).

Almost surely, 2^1231245311 is an apocalyptic number.

1231245311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231245311 is an equidigital number, since it uses as much as digits as its factorization.

1231245311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 1231245311 is about 35089.1053034984. The cubic root of 1231245311 is about 1071.8027405733.

Adding to 1231245311 its reverse (1135421321), we get a palindrome (2366666632).

The spelling of 1231245311 in words is "one billion, two hundred thirty-one million, two hundred forty-five thousand, three hundred eleven".