1331277505 has 4 divisors (see below), whose sum is σ = 1597533012. Its totient is φ = 1065022000.

The previous prime is 1331277499. The next prime is 1331277511. The reversal of 1331277505 is 5057721331.

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

It is an interprime number because it is at equal distance from previous prime (1331277499) and next prime (1331277511).

It can be written as a sum of positive squares in 2 ways, for example, as 1015824384 + 315453121 = 31872^2 + 17761^2 .

It is not a de Polignac number, because 1331277505 - 2¹⁵ = 1331244737 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, 133127746 + ... + 133127755.

It is an arithmetic number, because the mean of its divisors is an integer number (399383253).

Almost surely, 2^1331277505 is an apocalyptic number.

It is an amenable number.

1331277505 is a deficient number, since it is larger than the sum of its proper divisors (266255507).

1331277505 is an equidigital number, since it uses as much as digits as its factorization.

1331277505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266255506.

The product of its (nonzero) digits is 22050, while the sum is 34.

The square root of 1331277505 is about 36486.6757186785. The cubic root of 1331277505 is about 1100.0764423461.

Adding to 1331277505 its reverse (5057721331), we get a palindrome (6388998836).

The spelling of 1331277505 in words is "one billion, three hundred thirty-one million, two hundred seventy-seven thousand, five hundred five".