1228553993 has 4 divisors (see below), whose sum is σ = 1281969408. Its totient is φ = 1175138580.

The previous prime is 1228553987. The next prime is 1228554007. The reversal of 1228553993 is 3993558221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1228553993 - 2⁶ = 1228553929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228553923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26707673 + ... + 26707718.

It is an arithmetic number, because the mean of its divisors is an integer number (320492352).

Almost surely, 2^1228553993 is an apocalyptic number.

It is an amenable number.

1228553993 is a deficient number, since it is larger than the sum of its proper divisors (53415415).

1228553993 is an equidigital number, since it uses as much as digits as its factorization.

1228553993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53415414.

The product of its digits is 583200, while the sum is 47.

The square root of 1228553993 is about 35050.7345572101. The cubic root of 1228553993 is about 1071.0212374131.

The spelling of 1228553993 in words is "one billion, two hundred twenty-eight million, five hundred fifty-three thousand, nine hundred ninety-three".