1331155226 has 4 divisors (see below), whose sum is σ = 1996732842. Its totient is φ = 665577612.

The previous prime is 1331155223. The next prime is 1331155271. The reversal of 1331155226 is 6225511331.

It is a Cunningham number, because it is equal to 36485²+1.

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

It can be written as a sum of positive squares in only one way, i.e., 1331155225 + 1 = 36485^2 + 1^2 .

It is a super-2 number, since 2×1331155226² = 3543948471414222152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1331155223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332788805 + ... + 332788808.

Almost surely, 2^1331155226 is an apocalyptic number.

1331155226 is a deficient number, since it is larger than the sum of its proper divisors (665577616).

1331155226 is an equidigital number, since it uses as much as digits as its factorization.

1331155226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665577615.

The product of its digits is 5400, while the sum is 29.

The square root of 1331155226 is about 36485.0000137043. Note that the first 4 decimals coincide. The cubic root of 1331155226 is about 1100.0427603212.

Adding to 1331155226 its reverse (6225511331), we get a palindrome (7556666557).

The spelling of 1331155226 in words is "one billion, three hundred thirty-one million, one hundred fifty-five thousand, two hundred twenty-six".