1139666491 has 12 divisors (see below), whose sum is σ = 1195351528. Its totient is φ = 1086475104.

The previous prime is 1139666471. The next prime is 1139666503. The reversal of 1139666491 is 1946669311.

It is not a de Polignac number, because 1139666491 - 2⁹ = 1139665979 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139666401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162136 + ... + 169018.

Almost surely, 2^1139666491 is an apocalyptic number.

1139666491 is a deficient number, since it is larger than the sum of its proper divisors (55685037).

1139666491 is an equidigital number, since it uses as much as digits as its factorization.

1139666491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7242 (or 7219 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 1139666491 is about 33758.9468289519. The cubic root of 1139666491 is about 1044.5420460820.

The spelling of 1139666491 in words is "one billion, one hundred thirty-nine million, six hundred sixty-six thousand, four hundred ninety-one".