1224813557 has 4 divisors (see below), whose sum is σ = 1336160256. Its totient is φ = 1113466860.

The previous prime is 1224813539. The next prime is 1224813581. The reversal of 1224813557 is 7553184221.

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 not a de Polignac number, because 1224813557 - 2⁶ = 1224813493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1224813557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224813857) 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, 55673333 + ... + 55673354.

It is an arithmetic number, because the mean of its divisors is an integer number (334040064).

Almost surely, 2^1224813557 is an apocalyptic number.

It is an amenable number.

1224813557 is a deficient number, since it is larger than the sum of its proper divisors (111346699).

1224813557 is a wasteful number, since it uses less digits than its factorization.

1224813557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111346698.

The product of its digits is 67200, while the sum is 38.

The square root of 1224813557 is about 34997.3364272197. The cubic root of 1224813557 is about 1069.9331943617.

Adding to 1224813557 its reverse (7553184221), we get a palindrome (8777997778).

The spelling of 1224813557 in words is "one billion, two hundred twenty-four million, eight hundred thirteen thousand, five hundred fifty-seven".