1171531172 has 24 divisors (see below), whose sum is σ = 2347423680. Its totient is φ = 501150240.

The previous prime is 1171531157. The next prime is 1171531187. The reversal of 1171531172 is 2711351711.

It is an interprime number because it is at equal distance from previous prime (1171531157) and next prime (1171531187).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23522 + ... + 53817.

It is an arithmetic number, because the mean of its divisors is an integer number (97809320).

Almost surely, 2^1171531172 is an apocalyptic number.

It is an amenable number.

1171531172 is an abundant number, since it is smaller than the sum of its proper divisors (1175892508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1171531172 is a wasteful number, since it uses less digits than its factorization.

1171531172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77891 (or 77889 counting only the distinct ones).

The product of its digits is 1470, while the sum is 29.

The square root of 1171531172 is about 34227.6375462871. The cubic root of 1171531172 is about 1054.1877119356.

Adding to 1171531172 its reverse (2711351711), we get a palindrome (3882882883).

The spelling of 1171531172 in words is "one billion, one hundred seventy-one million, five hundred thirty-one thousand, one hundred seventy-two".