1228317557 has 4 divisors (see below), whose sum is σ = 1267940736. Its totient is φ = 1188694380.

The previous prime is 1228317551. The next prime is 1228317577. The reversal of 1228317557 is 7557138221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7557138221 = 23 ⋅328571227.

It is not a de Polignac number, because 1228317557 - 2²² = 1224123253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228317551) 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, 19811543 + ... + 19811604.

It is an arithmetic number, because the mean of its divisors is an integer number (316985184).

Almost surely, 2^1228317557 is an apocalyptic number.

It is an amenable number.

1228317557 is a deficient number, since it is larger than the sum of its proper divisors (39623179).

1228317557 is an equidigital number, since it uses as much as digits as its factorization.

1228317557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39623178.

The product of its digits is 117600, while the sum is 41.

The square root of 1228317557 is about 35047.3616268044. The cubic root of 1228317557 is about 1070.9525267649.

The spelling of 1228317557 in words is "one billion, two hundred twenty-eight million, three hundred seventeen thousand, five hundred fifty-seven".