1213360155 has 40 divisors (see below), whose sum is σ = 2485789152. Its totient is φ = 554677632.

The previous prime is 1213360123. The next prime is 1213360163. The reversal of 1213360155 is 5510633121.

1213360155 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 3 + 601 + 55 = 666.

It is not a de Polignac number, because 1213360155 - 2⁵ = 1213360123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 211162 + ... + 216831.

Almost surely, 2^1213360155 is an apocalyptic number.

1213360155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213360155 is an abundant number, since it is smaller than the sum of its proper divisors (1272428997).

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

1213360155 is an equidigital number, since it uses as much as digits as its factorization.

1213360155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428017 (or 428008 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1213360155 is about 34833.3196092477. The cubic root of 1213360155 is about 1066.5877131774.

Adding to 1213360155 its reverse (5510633121), we get a palindrome (6723993276).

The spelling of 1213360155 in words is "one billion, two hundred thirteen million, three hundred sixty thousand, one hundred fifty-five".