1213231631 has 2 divisors, whose sum is σ = 1213231632. Its totient is φ = 1213231630.

The previous prime is 1213231601. The next prime is 1213231651. The reversal of 1213231631 is 1361323121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213231631 - 2¹⁸ = 1212969487 is a prime.

It is a super-2 number, since 2×1213231631² = 2943861980917840322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213231597 and 1213231606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213231601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606615815 + 606615816.

It is an arithmetic number, because the mean of its divisors is an integer number (606615816).

Almost surely, 2^1213231631 is an apocalyptic number.

1213231631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213231631 is an equidigital number, since it uses as much as digits as its factorization.

1213231631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

The square root of 1213231631 is about 34831.4747175597. The cubic root of 1213231631 is about 1066.5500527572.

Adding to 1213231631 its reverse (1361323121), we get a palindrome (2574554752).

The spelling of 1213231631 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, six hundred thirty-one".