1215351500 has 48 divisors (see below), whose sum is σ = 2895643296. Its totient is φ = 441944000.

The previous prime is 1215351491. The next prime is 1215351503. The reversal of 1215351500 is 51535121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1215351503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104987 + ... + 115986.

It is an arithmetic number, because the mean of its divisors is an integer number (60325902).

Almost surely, 2^1215351500 is an apocalyptic number.

1215351500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215351500 is an abundant number, since it is smaller than the sum of its proper divisors (1680291796).

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

1215351500 is a wasteful number, since it uses less digits than its factorization.

1215351500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221003 (or 220991 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1215351500 is about 34861.8918017941. The cubic root of 1215351500 is about 1067.1708824952.

Adding to 1215351500 its reverse (51535121), we get a palindrome (1266886621).

The spelling of 1215351500 in words is "one billion, two hundred fifteen million, three hundred fifty-one thousand, five hundred".