1261326533 has 8 divisors (see below), whose sum is σ = 1328171520. Its totient is φ = 1194527520.

The previous prime is 1261326529. The next prime is 1261326569. The reversal of 1261326533 is 3356231621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261326533 - 2² = 1261326529 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 1261326533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261326503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54641 + ... + 74217.

It is an arithmetic number, because the mean of its divisors is an integer number (166021440).

Almost surely, 2^1261326533 is an apocalyptic number.

It is an amenable number.

1261326533 is a deficient number, since it is larger than the sum of its proper divisors (66844987).

1261326533 is a wasteful number, since it uses less digits than its factorization.

1261326533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22987.

The product of its digits is 19440, while the sum is 32.

The square root of 1261326533 is about 35515.1591999811. The cubic root of 1261326533 is about 1080.4612036252.

The spelling of 1261326533 in words is "one billion, two hundred sixty-one million, three hundred twenty-six thousand, five hundred thirty-three".