1231201366 has 4 divisors (see below), whose sum is σ = 1846802052. Its totient is φ = 615600682.

The previous prime is 1231201357. The next prime is 1231201393. The reversal of 1231201366 is 6631021321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6631021321 = 433 ⋅15314137.

It is a self number, because there is not a number n which added to its sum of digits gives 1231201366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307800340 + ... + 307800343.

It is an arithmetic number, because the mean of its divisors is an integer number (461700513).

Almost surely, 2^1231201366 is an apocalyptic number.

1231201366 is a deficient number, since it is larger than the sum of its proper divisors (615600686).

1231201366 is an equidigital number, since it uses as much as digits as its factorization.

1231201366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615600685.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1231201366 is about 35088.4791063962. The cubic root of 1231201366 is about 1071.7899890034.

Adding to 1231201366 its reverse (6631021321), we get a palindrome (7862222687).

The spelling of 1231201366 in words is "one billion, two hundred thirty-one million, two hundred one thousand, three hundred sixty-six".