1231321055 has 8 divisors (see below), whose sum is σ = 1477774800. Its totient is φ = 984930496.

The previous prime is 1231321043. The next prime is 1231321079. The reversal of 1231321055 is 5501231321.

It is a happy number.

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 1231321055 - 2⁸ = 1231320799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231321055.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61256 + ... + 78834.

It is an arithmetic number, because the mean of its divisors is an integer number (184721850).

Almost surely, 2^1231321055 is an apocalyptic number.

1231321055 is a deficient number, since it is larger than the sum of its proper divisors (246453745).

1231321055 is a wasteful number, since it uses less digits than its factorization.

1231321055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31593.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1231321055 is about 35090.1845962657. The cubic root of 1231321055 is about 1071.8247185825.

Adding to 1231321055 its reverse (5501231321), we get a palindrome (6732552376).

The spelling of 1231321055 in words is "one billion, two hundred thirty-one million, three hundred twenty-one thousand, fifty-five".