1171382981 has 4 divisors (see below), whose sum is σ = 1177927200. Its totient is φ = 1164838764.

The previous prime is 1171382959. The next prime is 1171382983. The reversal of 1171382981 is 1892831711.

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 a de Polignac number, because none of the positive numbers 2^k-1171382981 is a prime.

It is a super-2 number, since 2×1171382981² = 2744276176352892722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171382983) 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, 3271841 + ... + 3272198.

It is an arithmetic number, because the mean of its divisors is an integer number (294481800).

Almost surely, 2^1171382981 is an apocalyptic number.

It is an amenable number.

1171382981 is a deficient number, since it is larger than the sum of its proper divisors (6544219).

1171382981 is an equidigital number, since it uses as much as digits as its factorization.

1171382981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6544218.

The product of its digits is 24192, while the sum is 41.

The square root of 1171382981 is about 34225.4726921339. The cubic root of 1171382981 is about 1054.1432607870.

The spelling of 1171382981 in words is "one billion, one hundred seventy-one million, three hundred eighty-two thousand, nine hundred eighty-one".