1161797909 has 4 divisors (see below), whose sum is σ = 1164318540. Its totient is φ = 1159277280.

The previous prime is 1161797893. The next prime is 1161797929. The reversal of 1161797909 is 9097971611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 885241009 + 276556900 = 29753^2 + 16630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161797909 - 2⁴ = 1161797893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161797929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259624 + ... + 1260545.

It is an arithmetic number, because the mean of its divisors is an integer number (291079635).

Almost surely, 2^1161797909 is an apocalyptic number.

It is an amenable number.

1161797909 is a deficient number, since it is larger than the sum of its proper divisors (2520631).

1161797909 is an equidigital number, since it uses as much as digits as its factorization.

1161797909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520630.

The product of its (nonzero) digits is 214326, while the sum is 50.

The square root of 1161797909 is about 34085.1567254722. The cubic root of 1161797909 is about 1051.2601375562.

The spelling of 1161797909 in words is "one billion, one hundred sixty-one million, seven hundred ninety-seven thousand, nine hundred nine".