1231200505 has 8 divisors (see below), whose sum is σ = 1488225672. Its totient is φ = 977770368.

The previous prime is 1231200499. The next prime is 1231200517. The reversal of 1231200505 is 5050021321.

It can be written as a sum of positive squares in 4 ways, for example, as 32761 + 1231167744 = 181^2 + 35088^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231200505 - 2⁵ = 1231200473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 898002 + ... + 899371.

It is an arithmetic number, because the mean of its divisors is an integer number (186028209).

Almost surely, 2^1231200505 is an apocalyptic number.

It is an amenable number.

1231200505 is a deficient number, since it is larger than the sum of its proper divisors (257025167).

1231200505 is a wasteful number, since it uses less digits than its factorization.

1231200505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797515.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1231200505 is about 35088.4668374097. The cubic root of 1231200505 is about 1071.7897391631.

Adding to 1231200505 its reverse (5050021321), we get a palindrome (6281221826).

The spelling of 1231200505 in words is "one billion, two hundred thirty-one million, two hundred thousand, five hundred five".