1331555 has 8 divisors (see below), whose sum is σ = 1605744. Its totient is φ = 1060000.

The previous prime is 1331549. The next prime is 1331567. The reversal of 1331555 is 5551331.

1331555 = 196² + 197² + ... + 225².

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

It is not a de Polignac number, because 1331555 - 2⁸ = 1331299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331555.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725 + ... + 1785.

It is an arithmetic number, because the mean of its divisors is an integer number (200718).

2^1331555 is an apocalyptic number.

1331555 is a deficient number, since it is larger than the sum of its proper divisors (274189).

1331555 is a wasteful number, since it uses less digits than its factorization.

1331555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317.

The product of its digits is 1125, while the sum is 23.

The square root of 1331555 is about 1153.9302405258. The cubic root of 1331555 is about 110.0152871316.

Adding to 1331555 its reverse (5551331), we get a palindrome (6882886).

The spelling of 1331555 in words is "one million, three hundred thirty-one thousand, five hundred fifty-five".