1161221709 has 8 divisors (see below), whose sum is σ = 1566950112. Its totient is φ = 764820560.

The previous prime is 1161221647. The next prime is 1161221713. The reversal of 1161221709 is 9071221611.

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-1161221709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161221729) 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, 2331522 + ... + 2332019.

It is an arithmetic number, because the mean of its divisors is an integer number (195868764).

Almost surely, 2^1161221709 is an apocalyptic number.

It is an amenable number.

1161221709 is a deficient number, since it is larger than the sum of its proper divisors (405728403).

1161221709 is an equidigital number, since it uses as much as digits as its factorization.

1161221709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663627.

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 1161221709 is about 34076.7033176626. The cubic root of 1161221709 is about 1051.0863160870.

The spelling of 1161221709 in words is "one billion, one hundred sixty-one million, two hundred twenty-one thousand, seven hundred nine".