1178885491 has 16 divisors (see below), whose sum is σ = 1374271488. Its totient is φ = 990410400.

The previous prime is 1178885483. The next prime is 1178885497. The reversal of 1178885491 is 1945888711.

It is not a de Polignac number, because 1178885491 - 2³ = 1178885483 is a prime.

It is a super-2 number, since 2×1178885491² = 2779542001780622162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1178885497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79126 + ... + 92836.

It is an arithmetic number, because the mean of its divisors is an integer number (85891968).

Almost surely, 2^1178885491 is an apocalyptic number.

1178885491 is a deficient number, since it is larger than the sum of its proper divisors (195385997).

1178885491 is a wasteful number, since it uses less digits than its factorization.

1178885491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13962.

The product of its digits is 645120, while the sum is 52.

The square root of 1178885491 is about 34334.9019366591. The cubic root of 1178885491 is about 1056.3890095118.

It can be divided in two parts, 11788 and 85491, that added together give a palindrome (97279).

The spelling of 1178885491 in words is "one billion, one hundred seventy-eight million, eight hundred eighty-five thousand, four hundred ninety-one".