1331312257 has 8 divisors (see below), whose sum is σ = 1452801600. Its totient is φ = 1209899760.

The previous prime is 1331312237. The next prime is 1331312261. The reversal of 1331312257 is 7522131331.

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 1331312257 - 2¹⁵ = 1331279489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331312237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20619 + ... + 55567.

It is an arithmetic number, because the mean of its divisors is an integer number (181600200).

Almost surely, 2^1331312257 is an apocalyptic number.

It is an amenable number.

1331312257 is a deficient number, since it is larger than the sum of its proper divisors (121489343).

1331312257 is a wasteful number, since it uses less digits than its factorization.

1331312257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38423.

The product of its digits is 3780, while the sum is 28.

The square root of 1331312257 is about 36487.1519442118. The cubic root of 1331312257 is about 1100.0860144860.

Adding to 1331312257 its reverse (7522131331), we get a palindrome (8853443588).

The spelling of 1331312257 in words is "one billion, three hundred thirty-one million, three hundred twelve thousand, two hundred fifty-seven".