1213631516 has 12 divisors (see below), whose sum is σ = 2124133032. Its totient is φ = 606736368.

The previous prime is 1213631483. The next prime is 1213631533. The reversal of 1213631516 is 6151363121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26651 + ... + 56013.

It is an arithmetic number, because the mean of its divisors is an integer number (177011086).

Almost surely, 2^1213631516 is an apocalyptic number.

It is an amenable number.

1213631516 is a deficient number, since it is larger than the sum of its proper divisors (910501516).

1213631516 is a wasteful number, since it uses less digits than its factorization.

1213631516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39700 (or 39698 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 1213631516 is about 34837.2145269968. The cubic root of 1213631516 is about 1066.6672193139.

Adding to 1213631516 its reverse (6151363121), we get a palindrome (7364994637).

The spelling of 1213631516 in words is "one billion, two hundred thirteen million, six hundred thirty-one thousand, five hundred sixteen".