1231660216 has 32 divisors (see below), whose sum is σ = 2377272240. Its totient is φ = 597961728.

The previous prime is 1231660207. The next prime is 1231660219. The reversal of 1231660216 is 6120661321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231660219) 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, 26155 + ... + 56101.

Almost surely, 2^1231660216 is an apocalyptic number.

It is an amenable number.

1231660216 is a deficient number, since it is larger than the sum of its proper divisors (1145612024).

1231660216 is a wasteful number, since it uses less digits than its factorization.

1231660216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30103 (or 30099 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1231660216 is about 35095.0169682250. The cubic root of 1231660216 is about 1071.9231190688.

The spelling of 1231660216 in words is "one billion, two hundred thirty-one million, six hundred sixty thousand, two hundred sixteen".