1181172081 has 8 divisors (see below), whose sum is σ = 1576979584. Its totient is φ = 786406320.

The previous prime is 1181172079. The next prime is 1181172103. The reversal of 1181172081 is 1802711811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1181172081 - 2¹ = 1181172079 is a prime.

It is a super-2 number, since 2×1181172081² = 2790334969867741122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181172281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257785 + ... + 262326.

It is an arithmetic number, because the mean of its divisors is an integer number (197122448).

Almost surely, 2^1181172081 is an apocalyptic number.

It is an amenable number.

1181172081 is a deficient number, since it is larger than the sum of its proper divisors (395807503).

1181172081 is an equidigital number, since it uses as much as digits as its factorization.

1181172081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520871.

The product of its (nonzero) digits is 896, while the sum is 30.

The square root of 1181172081 is about 34368.1841388223. The cubic root of 1181172081 is about 1057.0715661888.

Adding to 1181172081 its reverse (1802711811), we get a palindrome (2983883892).

The spelling of 1181172081 in words is "one billion, one hundred eighty-one million, one hundred seventy-two thousand, eighty-one".