1215061564 has 12 divisors (see below), whose sum is σ = 2129589000. Its totient is φ = 606607568.

The previous prime is 1215061543. The next prime is 1215061579. The reversal of 1215061564 is 4651605121.

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, 227839 + ... + 233110.

It is an arithmetic number, because the mean of its divisors is an integer number (177465750).

Almost surely, 2^1215061564 is an apocalyptic number.

It is an amenable number.

1215061564 is a deficient number, since it is larger than the sum of its proper divisors (914527436).

1215061564 is a wasteful number, since it uses less digits than its factorization.

1215061564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461612 (or 461610 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1215061564 is about 34857.7332022609. The cubic root of 1215061564 is about 1067.0860138064.

Adding to 1215061564 its reverse (4651605121), we get a palindrome (5866666685).

The spelling of 1215061564 in words is "one billion, two hundred fifteen million, sixty-one thousand, five hundred sixty-four".