1213115604 has 12 divisors (see below), whose sum is σ = 2830603104. Its totient is φ = 404371864.

The previous prime is 1213115587. The next prime is 1213115621. The reversal of 1213115604 is 4065113121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1213115587) and next prime (1213115621).

It is a tau number, because it is divible by the number of its divisors (12).

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, 50546472 + ... + 50546495.

It is an arithmetic number, because the mean of its divisors is an integer number (235883592).

Almost surely, 2^1213115604 is an apocalyptic number.

It is an amenable number.

1213115604 is an abundant number, since it is smaller than the sum of its proper divisors (1617487500).

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

1213115604 is a wasteful number, since it uses less digits than its factorization.

1213115604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101092974 (or 101092972 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1213115604 is about 34829.8091295373. The cubic root of 1213115604 is about 1066.5160519545.

Adding to 1213115604 its reverse (4065113121), we get a palindrome (5278228725).

The spelling of 1213115604 in words is "one billion, two hundred thirteen million, one hundred fifteen thousand, six hundred four".