1331405155 has 4 divisors (see below), whose sum is σ = 1597686192. Its totient is φ = 1065124120.

The previous prime is 1331405137. The next prime is 1331405189. The reversal of 1331405155 is 5515041331.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1331405155 - 2¹⁹ = 1330880867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 133140511 + ... + 133140520.

It is an arithmetic number, because the mean of its divisors is an integer number (399421548).

Almost surely, 2^1331405155 is an apocalyptic number.

1331405155 is a deficient number, since it is larger than the sum of its proper divisors (266281037).

1331405155 is an equidigital number, since it uses as much as digits as its factorization.

1331405155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266281036.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1331405155 is about 36488.4249454536. The cubic root of 1331405155 is about 1100.1116016246. Note that the first 3 decimals are identical.

Adding to 1331405155 its reverse (5515041331), we get a palindrome (6846446486).

The spelling of 1331405155 in words is "one billion, three hundred thirty-one million, four hundred five thousand, one hundred fifty-five".