1275133937509 has 4 divisors (see below), whose sum is σ = 1350141816204. Its totient is φ = 1200126058816.

The previous prime is 1275133937477. The next prime is 1275133937537. The reversal of 1275133937509 is 9057393315721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1038473093025 + 236660844484 = 1019055^2 + 486478^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275133937509 - 2⁵ = 1275133937477 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 1275133937509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275133937579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37503939322 + ... + 37503939355.

It is an arithmetic number, because the mean of its divisors is an integer number (337535454051).

Almost surely, 2^{1275133937509} is an apocalyptic number.

It is an amenable number.

1275133937509 is a deficient number, since it is larger than the sum of its proper divisors (75007878695).

1275133937509 is an equidigital number, since it uses as much as digits as its factorization.

1275133937509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75007878694.

The product of its (nonzero) digits is 5358150, while the sum is 55.

The spelling of 1275133937509 in words is "one trillion, two hundred seventy-five billion, one hundred thirty-three million, nine hundred thirty-seven thousand, five hundred nine".