1331228197 has 8 divisors (see below), whose sum is σ = 1517961816. Its totient is φ = 1156541952.

The previous prime is 1331228183. The next prime is 1331228207. The reversal of 1331228197 is 7918221331.

It is a Cunningham number, because it is equal to 36486²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 1331228196 = 1^2 + 36486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331228197 - 2²³ = 1322839589 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 (1331228137) 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 in 7 ways as a sum of consecutive naturals, for example, 3011608 + ... + 3012049.

It is an arithmetic number, because the mean of its divisors is an integer number (189745227).

Almost surely, 2^1331228197 is an apocalyptic number.

1331228197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1331228197 is a deficient number, since it is larger than the sum of its proper divisors (186733619).

1331228197 is a wasteful number, since it uses less digits than its factorization.

1331228197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023687.

The product of its digits is 18144, while the sum is 37.

The square root of 1331228197 is about 36486.0000137039. Note that the first 4 decimals coincide. The cubic root of 1331228197 is about 1100.0628605950.

The spelling of 1331228197 in words is "one billion, three hundred thirty-one million, two hundred twenty-eight thousand, one hundred ninety-seven".