1331351397 has 40 divisors (see below), whose sum is σ = 2028284280. Its totient is φ = 870134400.

The previous prime is 1331351393. The next prime is 1331351479. The reversal of 1331351397 is 7931531331.

1331351397 is a `hidden beast` number, since 133 + 1 + 3 + 513 + 9 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 939667716 + 391683681 = 30654^2 + 19791^2 .

It is not a de Polignac number, because 1331351397 - 2² = 1331351393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331351393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 890983 + ... + 892475.

It is an arithmetic number, because the mean of its divisors is an integer number (50707107).

Almost surely, 2^1331351397 is an apocalyptic number.

It is an amenable number.

1331351397 is a deficient number, since it is larger than the sum of its proper divisors (696932883).

1331351397 is a wasteful number, since it uses less digits than its factorization.

1331351397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 1706 counting only the distinct ones).

The product of its digits is 25515, while the sum is 36.

The square root of 1331351397 is about 36487.6882934504. The cubic root of 1331351397 is about 1100.0967950635.

The spelling of 1331351397 in words is "one billion, three hundred thirty-one million, three hundred fifty-one thousand, three hundred ninety-seven".