1200631906 has 4 divisors (see below), whose sum is σ = 1800947862. Its totient is φ = 600315952.

The previous prime is 1200631903. The next prime is 1200631933. The reversal of 1200631906 is 6091360021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 775901025 + 424730881 = 27855^2 + 20609^2 .

It is not an unprimeable number, because it can be changed into a prime (1200631903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300157975 + ... + 300157978.

Almost surely, 2^1200631906 is an apocalyptic number.

1200631906 is a deficient number, since it is larger than the sum of its proper divisors (600315956).

1200631906 is an equidigital number, since it uses as much as digits as its factorization.

1200631906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600315955.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1200631906 is about 34650.1357284499. The cubic root of 1200631906 is about 1062.8450643193.

Adding to 1200631906 its reverse (6091360021), we get a palindrome (7291991927).

The spelling of 1200631906 in words is "one billion, two hundred million, six hundred thirty-one thousand, nine hundred six".