1226331553 has 4 divisors (see below), whose sum is σ = 1234142740. Its totient is φ = 1218520368.

The previous prime is 1226331527. The next prime is 1226331559. The reversal of 1226331553 is 3551336221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 300224929 + 926106624 = 17327^2 + 30432^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226331553 - 2²⁵ = 1192777121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226331559) 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, 3905358 + ... + 3905671.

It is an arithmetic number, because the mean of its divisors is an integer number (308535685).

Almost surely, 2^1226331553 is an apocalyptic number.

It is an amenable number.

1226331553 is a deficient number, since it is larger than the sum of its proper divisors (7811187).

1226331553 is an equidigital number, since it uses as much as digits as its factorization.

1226331553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7811186.

The product of its digits is 16200, while the sum is 31.

The square root of 1226331553 is about 35019.0170193282. The cubic root of 1226331553 is about 1070.3750259058.

Adding to 1226331553 its reverse (3551336221), we get a palindrome (4777667774).

The spelling of 1226331553 in words is "one billion, two hundred twenty-six million, three hundred thirty-one thousand, five hundred fifty-three".