1215122564 has 6 divisors (see below), whose sum is σ = 2126464494. Its totient is φ = 607561280.

The previous prime is 1215122563. The next prime is 1215122567. The reversal of 1215122564 is 4652215121.

It can be written as a sum of positive squares in only one way, i.e., 1200068164 + 15054400 = 34642^2 + 3880^2 .

It is not an unprimeable number, because it can be changed into a prime (1215122563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151890317 + ... + 151890324.

It is an arithmetic number, because the mean of its divisors is an integer number (354410749).

Almost surely, 2^1215122564 is an apocalyptic number.

It is an amenable number.

1215122564 is a deficient number, since it is larger than the sum of its proper divisors (911341930).

1215122564 is a wasteful number, since it uses less digits than its factorization.

1215122564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303780645 (or 303780643 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 1215122564 is about 34858.6081764605. The cubic root of 1215122564 is about 1067.1038705580.

Adding to 1215122564 its reverse (4652215121), we get a palindrome (5867337685).

The spelling of 1215122564 in words is "one billion, two hundred fifteen million, one hundred twenty-two thousand, five hundred sixty-four".