1180540881 has 27 divisors (see below), whose sum is σ = 1848585297.
Its totient is φ = 725662080.
The previous prime is 1180540873. The next prime is 1180540901. The reversal of 1180540881 is 1880450811.
Multipling 1180540881 by its sum of digits (36), we get a square (42499471716 = 2061542).
It is a happy number.
The square root of 1180540881 is 34359.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in 4 ways, for example, as 541260225 + 639280656 = 23265^2 + 25284^2
It is not a de Polignac number, because 1180540881 - 23 = 1180540873 is a prime.
It is a super-2 number, since 2×11805408812 = 2787353543424512322, which contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (1180540811) by changing a digit.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1339561 + ... + 1340441.
Almost surely, 21180540881 is an apocalyptic number.
1180540881 is the 34359-th square number.
1180540881 is the 17180-th centered octagonal number.
It is an amenable number.
1180540881 is a deficient number, since it is larger than the sum of its proper divisors (668044416).
1180540881 is an frugal number, since it uses more digits than its factorization.
1180540881 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1794 (or 897 counting only the distinct ones).
The product of its (nonzero) digits is 10240, while the sum is 36.
The cubic root of 1180540881 is about 1056.8832384337.
The spelling of 1180540881 in words is "one billion, one hundred eighty million, five hundred forty thousand, eight hundred eighty-one".