1161242761 has 4 divisors (see below), whose sum is σ = 1327134592. Its totient is φ = 995350932.

The previous prime is 1161242759. The next prime is 1161242813. The reversal of 1161242761 is 1672421611.

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 a cyclic number.

It is not a de Polignac number, because 1161242761 - 2¹ = 1161242759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161242711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82945905 + ... + 82945918.

It is an arithmetic number, because the mean of its divisors is an integer number (331783648).

Almost surely, 2^1161242761 is an apocalyptic number.

It is an amenable number.

1161242761 is a deficient number, since it is larger than the sum of its proper divisors (165891831).

1161242761 is an equidigital number, since it uses as much as digits as its factorization.

1161242761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165891830.

The product of its digits is 4032, while the sum is 31.

The square root of 1161242761 is about 34077.0122076452. The cubic root of 1161242761 is about 1051.0926678271.

The spelling of 1161242761 in words is "one billion, one hundred sixty-one million, two hundred forty-two thousand, seven hundred sixty-one".