1161276817 has 4 divisors (see below), whose sum is σ = 1229587236. Its totient is φ = 1092966400.

The previous prime is 1161276811. The next prime is 1161276847. The reversal of 1161276817 is 7186721611.

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 894967056 + 266309761 = 29916^2 + 16319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161276817 - 2¹¹ = 1161274769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161276817.

It is not an unprimeable number, because it can be changed into a prime (1161276811) 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, 34155184 + ... + 34155217.

It is an arithmetic number, because the mean of its divisors is an integer number (307396809).

Almost surely, 2^1161276817 is an apocalyptic number.

1161276817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1161276817 is a deficient number, since it is larger than the sum of its proper divisors (68310419).

1161276817 is an equidigital number, since it uses as much as digits as its factorization.

1161276817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68310418.

The product of its digits is 28224, while the sum is 40.

The square root of 1161276817 is about 34077.5118956769. The cubic root of 1161276817 is about 1051.1029429287.

The spelling of 1161276817 in words is "one billion, one hundred sixty-one million, two hundred seventy-six thousand, eight hundred seventeen".