1261946533 has 12 divisors (see below), whose sum is σ = 1341834372. Its totient is φ = 1186572800.

The previous prime is 1261946527. The next prime is 1261946557. The reversal of 1261946533 is 3356491621.

It can be written as a sum of positive squares in 6 ways, for example, as 1483524 + 1260463009 = 1218^2 + 35503^2 .

It is not a de Polignac number, because 1261946533 - 2⁵ = 1261946501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261946563) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 548241 + ... + 550537.

It is an arithmetic number, because the mean of its divisors is an integer number (111819531).

Almost surely, 2^1261946533 is an apocalyptic number.

It is an amenable number.

1261946533 is a deficient number, since it is larger than the sum of its proper divisors (79887839).

1261946533 is a wasteful number, since it uses less digits than its factorization.

1261946533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4232 (or 4215 counting only the distinct ones).

The product of its digits is 116640, while the sum is 40.

The square root of 1261946533 is about 35523.8867946625. The cubic root of 1261946533 is about 1080.6382067509.

The spelling of 1261946533 in words is "one billion, two hundred sixty-one million, nine hundred forty-six thousand, five hundred thirty-three".