1209271085 has 8 divisors (see below), whose sum is σ = 1583045856. Its totient is φ = 879469840.

The previous prime is 1209271051. The next prime is 1209271117. The reversal of 1209271085 is 5801729021.

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

It is not a de Polignac number, because 1209271085 - 2¹⁴ = 1209254701 is a prime.

It is a Duffinian number.

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, 10993319 + ... + 10993428.

It is an arithmetic number, because the mean of its divisors is an integer number (197880732).

Almost surely, 2^1209271085 is an apocalyptic number.

It is an amenable number.

1209271085 is a deficient number, since it is larger than the sum of its proper divisors (373774771).

1209271085 is a wasteful number, since it uses less digits than its factorization.

1209271085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21986763.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 1209271085 is about 34774.5752669964. The cubic root of 1209271085 is about 1065.3882176269.

The spelling of 1209271085 in words is "one billion, two hundred nine million, two hundred seventy-one thousand, eighty-five".