1215322530 has 32 divisors (see below), whose sum is σ = 3043592064. Its totient is φ = 309995136.

The previous prime is 1215322529. The next prime is 1215322531. The reversal of 1215322530 is 352235121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1215322529) and next prime (1215322531).

It is a self number, because there is not a number n which added to its sum of digits gives 1215322530.

It is not an unprimeable number, because it can be changed into a prime (1215322531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 879979 + ... + 881358.

It is an arithmetic number, because the mean of its divisors is an integer number (95112252).

Almost surely, 2^1215322530 is an apocalyptic number.

1215322530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215322530 is an abundant number, since it is smaller than the sum of its proper divisors (1828269534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215322530 is a wasteful number, since it uses less digits than its factorization.

1215322530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761370.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1215322530 is about 34861.4763026467. The cubic root of 1215322530 is about 1067.1624031414.

Adding to 1215322530 its reverse (352235121), we get a palindrome (1567557651).

The spelling of 1215322530 in words is "one billion, two hundred fifteen million, three hundred twenty-two thousand, five hundred thirty".