1261842611 has 8 divisors (see below), whose sum is σ = 1359145920. Its totient is φ = 1167628392.

The previous prime is 1261842587. The next prime is 1261842613. The reversal of 1261842611 is 1162481621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261842611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261842613) 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, 771425 + ... + 773058.

It is an arithmetic number, because the mean of its divisors is an integer number (169893240).

Almost surely, 2^1261842611 is an apocalyptic number.

1261842611 is a deficient number, since it is larger than the sum of its proper divisors (97303309).

1261842611 is a wasteful number, since it uses less digits than its factorization.

1261842611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544545.

The product of its digits is 4608, while the sum is 32.

The square root of 1261842611 is about 35522.4240586140. The cubic root of 1261842611 is about 1080.6085422171.

The spelling of 1261842611 in words is "one billion, two hundred sixty-one million, eight hundred forty-two thousand, six hundred eleven".