1260870861 has 4 divisors (see below), whose sum is σ = 1681161152. Its totient is φ = 840580572.

The previous prime is 1260870851. The next prime is 1260870881. The reversal of 1260870861 is 1680780621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1260870861 - 2¹⁹ = 1260346573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260870851) 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 3 ways as a sum of consecutive naturals, for example, 210145141 + ... + 210145146.

It is an arithmetic number, because the mean of its divisors is an integer number (420290288).

Almost surely, 2^1260870861 is an apocalyptic number.

It is an amenable number.

1260870861 is a deficient number, since it is larger than the sum of its proper divisors (420290291).

1260870861 is an equidigital number, since it uses as much as digits as its factorization.

1260870861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420290290.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 1260870861 is about 35508.7434443969. The cubic root of 1260870861 is about 1080.3310773377.

The spelling of 1260870861 in words is "one billion, two hundred sixty million, eight hundred seventy thousand, eight hundred sixty-one".