1213605963 has 8 divisors (see below), whose sum is σ = 1797934800. Its totient is φ = 809070624.

The previous prime is 1213605961. The next prime is 1213605977. The reversal of 1213605963 is 3695063121.

1213605963 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 60 + 596 + 3 = 666.

It is not a de Polignac number, because 1213605963 - 2¹ = 1213605961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213605961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22474158 + ... + 22474211.

It is an arithmetic number, because the mean of its divisors is an integer number (224741850).

Almost surely, 2^1213605963 is an apocalyptic number.

1213605963 is a deficient number, since it is larger than the sum of its proper divisors (584328837).

1213605963 is an equidigital number, since it uses as much as digits as its factorization.

1213605963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44948378 (or 44948372 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 1213605963 is about 34836.8477764565. The cubic root of 1213605963 is about 1066.6597330387.

The spelling of 1213605963 in words is "one billion, two hundred thirteen million, six hundred five thousand, nine hundred sixty-three".