1139178491 has 8 divisors (see below), whose sum is σ = 1246664304. Its totient is φ = 1032346720.

The previous prime is 1139178473. The next prime is 1139178503. The reversal of 1139178491 is 1948719311.

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

It is a cyclic number.

It is not a de Polignac number, because 1139178491 - 2¹⁰ = 1139177467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1139171491) 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, 159860 + ... + 166833.

It is an arithmetic number, because the mean of its divisors is an integer number (155833038).

Almost surely, 2^1139178491 is an apocalyptic number.

1139178491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1139178491 is a deficient number, since it is larger than the sum of its proper divisors (107485813).

1139178491 is a wasteful number, since it uses less digits than its factorization.

1139178491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327021.

The product of its digits is 54432, while the sum is 44.

The square root of 1139178491 is about 33751.7183414415. The cubic root of 1139178491 is about 1044.3929354152.

The spelling of 1139178491 in words is "one billion, one hundred thirty-nine million, one hundred seventy-eight thousand, four hundred ninety-one".