1243128622 has 4 divisors (see below), whose sum is σ = 1864692936. Its totient is φ = 621564310.

The previous prime is 1243128617. The next prime is 1243128629. The reversal of 1243128622 is 2268213421.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243128629) by changing a digit.

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, 310782154 + ... + 310782157.

It is an arithmetic number, because the mean of its divisors is an integer number (466173234).

Almost surely, 2^1243128622 is an apocalyptic number.

1243128622 is a deficient number, since it is larger than the sum of its proper divisors (621564314).

1243128622 is an equidigital number, since it uses as much as digits as its factorization.

1243128622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621564313.

The product of its digits is 9216, while the sum is 31.

The square root of 1243128622 is about 35258.0291848538. The cubic root of 1243128622 is about 1075.2398590789.

The spelling of 1243128622 in words is "one billion, two hundred forty-three million, one hundred twenty-eight thousand, six hundred twenty-two".