1261152775 has 12 divisors (see below), whose sum is σ = 1579954432. Its totient is φ = 998519040.

The previous prime is 1261152773. The next prime is 1261152787. The reversal of 1261152775 is 5772511621.

It is not a de Polignac number, because 1261152775 - 2¹ = 1261152773 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261152773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257607 + ... + 262456.

Almost surely, 2^1261152775 is an apocalyptic number.

1261152775 is a deficient number, since it is larger than the sum of its proper divisors (318801657).

1261152775 is an equidigital number, since it uses as much as digits as its factorization.

1261152775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520170 (or 520165 counting only the distinct ones).

The product of its digits is 29400, while the sum is 37.

The square root of 1261152775 is about 35512.7128645504. The cubic root of 1261152775 is about 1080.4115872374.

The spelling of 1261152775 in words is "one billion, two hundred sixty-one million, one hundred fifty-two thousand, seven hundred seventy-five".