1231686272 has 16 divisors (see below), whose sum is σ = 2453750250. Its totient is φ = 615843072.

The previous prime is 1231686241. The next prime is 1231686293. The reversal of 1231686272 is 2726861321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1135959616 + 95726656 = 33704^2 + 9784^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4811147 + ... + 4811402.

Almost surely, 2^1231686272 is an apocalyptic number.

It is an amenable number.

1231686272 is a deficient number, since it is larger than the sum of its proper divisors (1222063978).

1231686272 is an frugal number, since it uses more digits than its factorization.

1231686272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622563 (or 9622551 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 1231686272 is about 35095.3881870539. The cubic root of 1231686272 is about 1071.9306779262.

The spelling of 1231686272 in words is "one billion, two hundred thirty-one million, six hundred eighty-six thousand, two hundred seventy-two".