1178313813 has 18 divisors (see below), whose sum is σ = 1758696342. Its totient is φ = 760196880.

The previous prime is 1178313811. The next prime is 1178313859. The reversal of 1178313813 is 3183138711.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 993951729 + 184362084 = 31527^2 + 13578^2 .

It is not a de Polignac number, because 1178313813 - 2¹ = 1178313811 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1178313811) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 59470 + ... + 76767.

Almost surely, 2^1178313813 is an apocalyptic number.

It is an amenable number.

1178313813 is a deficient number, since it is larger than the sum of its proper divisors (580382529).

1178313813 is a wasteful number, since it uses less digits than its factorization.

1178313813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136305 (or 136271 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1178313813 is about 34326.5758997311. The cubic root of 1178313813 is about 1056.2182233452.

The spelling of 1178313813 in words is "one billion, one hundred seventy-eight million, three hundred thirteen thousand, eight hundred thirteen".