1213565634 has 48 divisors (see below), whose sum is σ = 2650190400. Its totient is φ = 401337888.

The previous prime is 1213565609. The next prime is 1213565653. The reversal of 1213565634 is 4365653121.

1213565634 is a `hidden beast` number, since 1 + 2 + 13 + 5 + 6 + 5 + 634 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1841197 + ... + 1841855.

It is an arithmetic number, because the mean of its divisors is an integer number (55212300).

Almost surely, 2^1213565634 is an apocalyptic number.

1213565634 is an abundant number, since it is smaller than the sum of its proper divisors (1436624766).

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

1213565634 is a wasteful number, since it uses less digits than its factorization.

1213565634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319 (or 1316 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 1213565634 is about 34836.2689448798. The cubic root of 1213565634 is about 1066.6479176175.

The spelling of 1213565634 in words is "one billion, two hundred thirteen million, five hundred sixty-five thousand, six hundred thirty-four".