1215331612 has 48 divisors (see below), whose sum is σ = 2350101600. Its totient is φ = 545350400.

The previous prime is 1215331591. The next prime is 1215331631. The reversal of 1215331612 is 2161335121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1291062 + ... + 1292002.

It is an arithmetic number, because the mean of its divisors is an integer number (48960450).

Almost surely, 2^1215331612 is an apocalyptic number.

It is an amenable number.

1215331612 is a deficient number, since it is larger than the sum of its proper divisors (1134769988).

1215331612 is a wasteful number, since it uses less digits than its factorization.

1215331612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 1300 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 1215331612 is about 34861.6065607998. The cubic root of 1215331612 is about 1067.1650614055.

Adding to 1215331612 its reverse (2161335121), we get a palindrome (3376666733).

The spelling of 1215331612 in words is "one billion, two hundred fifteen million, three hundred thirty-one thousand, six hundred twelve".