1331837685 has 12 divisors (see below), whose sum is σ = 2308518732. Its totient is φ = 710313408.

The previous prime is 1331837659. The next prime is 1331837707. The reversal of 1331837685 is 5867381331.

It can be written as a sum of positive squares in 2 ways, for example, as 911013489 + 420824196 = 30183^2 + 20514^2 .

It is not a de Polignac number, because 1331837685 - 2¹³ = 1331829493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 29596393 = 1331837685 / (1 + 3 + 3 + 1 + 8 + 3 + 7 + 6 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1331837685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14798152 + ... + 14798241.

It is an arithmetic number, because the mean of its divisors is an integer number (192376561).

Almost surely, 2^1331837685 is an apocalyptic number.

1331837685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331837685 is a deficient number, since it is larger than the sum of its proper divisors (976681047).

1331837685 is a wasteful number, since it uses less digits than its factorization.

1331837685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29596404 (or 29596401 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1331837685 is about 36494.3514122391. The cubic root of 1331837685 is about 1100.2307188223.

The spelling of 1331837685 in words is "one billion, three hundred thirty-one million, eight hundred thirty-seven thousand, six hundred eighty-five".