1231320633 has 8 divisors (see below), whose sum is σ = 1643666688. Its totient is φ = 819927504.

The previous prime is 1231320613. The next prime is 1231320637. The reversal of 1231320633 is 3360231321.

It is a happy number.

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

It is not a de Polignac number, because 1231320633 - 2¹³ = 1231312441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231320637) 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, 235210 + ... + 240387.

It is an arithmetic number, because the mean of its divisors is an integer number (205458336).

Almost surely, 2^1231320633 is an apocalyptic number.

It is an amenable number.

1231320633 is a deficient number, since it is larger than the sum of its proper divisors (412346055).

1231320633 is an equidigital number, since it uses as much as digits as its factorization.

1231320633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476463.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 1231320633 is about 35090.1785831876. The cubic root of 1231320633 is about 1071.8245961367.

Adding to 1231320633 its reverse (3360231321), we get a palindrome (4591551954).

The spelling of 1231320633 in words is "one billion, two hundred thirty-one million, three hundred twenty thousand, six hundred thirty-three".