1226611153 has 4 divisors (see below), whose sum is σ = 1232424688. Its totient is φ = 1220797620.

The previous prime is 1226611129. The next prime is 1226611157. The reversal of 1226611153 is 3511166221.

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: 3511166221 = 2999 ⋅1170779.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1226611153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226611157) 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, 2906451 + ... + 2906872.

It is an arithmetic number, because the mean of its divisors is an integer number (308106172).

Almost surely, 2^1226611153 is an apocalyptic number.

It is an amenable number.

1226611153 is a deficient number, since it is larger than the sum of its proper divisors (5813535).

1226611153 is an equidigital number, since it uses as much as digits as its factorization.

1226611153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5813534.

The product of its digits is 2160, while the sum is 28.

The square root of 1226611153 is about 35023.0089084305. The cubic root of 1226611153 is about 1070.4563671805.

Adding to 1226611153 its reverse (3511166221), we get a palindrome (4737777374).

The spelling of 1226611153 in words is "one billion, two hundred twenty-six million, six hundred eleven thousand, one hundred fifty-three".