1156171982 has 8 divisors (see below), whose sum is σ = 1982009136. Its totient is φ = 495502272.

The previous prime is 1156171943. The next prime is 1156171993. The reversal of 1156171982 is 2891716511.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41291843 + ... + 41291870.

It is an arithmetic number, because the mean of its divisors is an integer number (247751142).

Almost surely, 2^1156171982 is an apocalyptic number.

1156171982 is a deficient number, since it is larger than the sum of its proper divisors (825837154).

1156171982 is an equidigital number, since it uses as much as digits as its factorization.

1156171982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82583722.

The product of its digits is 30240, while the sum is 41.

The square root of 1156171982 is about 34002.5290529984. The cubic root of 1156171982 is about 1049.5605060156.

The spelling of 1156171982 in words is "one billion, one hundred fifty-six million, one hundred seventy-one thousand, nine hundred eighty-two".