1213816831 has 2 divisors, whose sum is σ = 1213816832. Its totient is φ = 1213816830.

The previous prime is 1213816801. The next prime is 1213816841. The reversal of 1213816831 is 1386183121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1386183121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213816831 - 2¹³ = 1213808639 is a prime.

It is a super-2 number, since 2×1213816831² = 2946702598437765122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213816801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606908415 + 606908416.

It is an arithmetic number, because the mean of its divisors is an integer number (606908416).

Almost surely, 2^1213816831 is an apocalyptic number.

1213816831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213816831 is an equidigital number, since it uses as much as digits as its factorization.

1213816831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 1213816831 is about 34839.8741530448. The cubic root of 1213816831 is about 1066.7215079985.

Adding to 1213816831 its reverse (1386183121), we get a palindrome (2599999952).

The spelling of 1213816831 in words is "one billion, two hundred thirteen million, eight hundred sixteen thousand, eight hundred thirty-one".