1213304631 has 36 divisors (see below), whose sum is σ = 2068521336. Its totient is φ = 630278880.

The previous prime is 1213304627. The next prime is 1213304647. The reversal of 1213304631 is 1364033121.

It is a happy number.

It is not a de Polignac number, because 1213304631 - 2² = 1213304627 is a prime.

It is a super-2 number, since 2×1213304631² = 2944216255212092322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213304621) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16320 + ... + 51893.

It is an arithmetic number, because the mean of its divisors is an integer number (57458926).

Almost surely, 2^1213304631 is an apocalyptic number.

1213304631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213304631 is a deficient number, since it is larger than the sum of its proper divisors (855216705).

1213304631 is a wasteful number, since it uses less digits than its factorization.

1213304631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68252 (or 68234 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 1213304631 is about 34832.5226046004. The cubic root of 1213304631 is about 1066.5714437239.

Adding to 1213304631 its reverse (1364033121), we get a palindrome (2577337752).

The spelling of 1213304631 in words is "one billion, two hundred thirteen million, three hundred four thousand, six hundred thirty-one".