1213643616 has 24 divisors (see below), whose sum is σ = 3185814744. Its totient is φ = 404547840.

The previous prime is 1213643597. The next prime is 1213643621. The reversal of 1213643616 is 6163463121.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

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, 6320965 + ... + 6321156.

It is an arithmetic number, because the mean of its divisors is an integer number (132742281).

Almost surely, 2^1213643616 is an apocalyptic number.

1213643616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213643616 is an abundant number, since it is smaller than the sum of its proper divisors (1972171128).

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

1213643616 is a wasteful number, since it uses less digits than its factorization.

1213643616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12642134 (or 12642126 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 1213643616 is about 34837.3881914245. The cubic root of 1213643616 is about 1066.6707642204.

The spelling of 1213643616 in words is "one billion, two hundred thirteen million, six hundred forty-three thousand, six hundred sixteen".