1180992561 has 16 divisors (see below), whose sum is σ = 1836336000. Its totient is φ = 674852304.

The previous prime is 1180992559. The next prime is 1180992563. The reversal of 1180992561 is 1652990811.

It is an interprime number because it is at equal distance from previous prime (1180992559) and next prime (1180992563).

It is not a de Polignac number, because 1180992561 - 2¹ = 1180992559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1180992563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 572826 + ... + 574883.

It is an arithmetic number, because the mean of its divisors is an integer number (114771000).

Almost surely, 2^1180992561 is an apocalyptic number.

It is an amenable number.

1180992561 is a deficient number, since it is larger than the sum of its proper divisors (655343439).

1180992561 is an equidigital number, since it uses as much as digits as its factorization.

1180992561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147733 (or 1147719 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1180992561 is about 34365.5723217292. The cubic root of 1180992561 is about 1057.0180105991.

The spelling of 1180992561 in words is "one billion, one hundred eighty million, nine hundred ninety-two thousand, five hundred sixty-one".