1261332005 has 8 divisors (see below), whose sum is σ = 1593261600. Its totient is φ = 955956816.

The previous prime is 1261331989. The next prime is 1261332013. The reversal of 1261332005 is 5002331621.

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 1261332005 - 2⁴ = 1261331989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6638495 + ... + 6638684.

It is an arithmetic number, because the mean of its divisors is an integer number (199157700).

Almost surely, 2^1261332005 is an apocalyptic number.

It is an amenable number.

1261332005 is a deficient number, since it is larger than the sum of its proper divisors (331929595).

1261332005 is a wasteful number, since it uses less digits than its factorization.

1261332005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13277203.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1261332005 is about 35515.2362374235. The cubic root of 1261332005 is about 1080.4627660742.

Adding to 1261332005 its reverse (5002331621), we get a palindrome (6263663626).

The spelling of 1261332005 in words is "one billion, two hundred sixty-one million, three hundred thirty-two thousand, five".