1213115530 has 32 divisors (see below), whose sum is σ = 2464266240. Its totient is φ = 425920320.

The previous prime is 1213115513. The next prime is 1213115551. The reversal of 1213115530 is 355113121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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, 186954 + ... + 193333.

It is an arithmetic number, because the mean of its divisors is an integer number (77008320).

Almost surely, 2^1213115530 is an apocalyptic number.

1213115530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213115530 is an abundant number, since it is smaller than the sum of its proper divisors (1251150710).

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

1213115530 is a wasteful number, since it uses less digits than its factorization.

1213115530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380334.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1213115530 is about 34829.8080672289. The cubic root of 1213115530 is about 1066.5160302687.

Adding to 1213115530 its reverse (355113121), we get a palindrome (1568228651).

The spelling of 1213115530 in words is "one billion, two hundred thirteen million, one hundred fifteen thousand, five hundred thirty".