1211323031 has 2 divisors, whose sum is σ = 1211323032. Its totient is φ = 1211323030.

The previous prime is 1211323007. The next prime is 1211323051. The reversal of 1211323031 is 1303231121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1303231121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211323031 - 2¹⁸ = 1211060887 is a prime.

It is a super-2 number, since 2×1211323031² = 2934606970862053922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211323051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605661515 + 605661516.

It is an arithmetic number, because the mean of its divisors is an integer number (605661516).

Almost surely, 2^1211323031 is an apocalyptic number.

1211323031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211323031 is an equidigital number, since it uses as much as digits as its factorization.

1211323031 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 1211323031 is about 34804.0662997874. The cubic root of 1211323031 is about 1065.9904767843.

Adding to 1211323031 its reverse (1303231121), we get a palindrome (2514554152).

The spelling of 1211323031 in words is "one billion, two hundred eleven million, three hundred twenty-three thousand, thirty-one".