1139399991 has 36 divisors (see below), whose sum is σ = 1695675072. Its totient is φ = 737224704.

The previous prime is 1139399981. The next prime is 1139400007. The reversal of 1139399991 is 1999939311.

It is not a de Polignac number, because 1139399991 - 2¹⁵ = 1139367223 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139399951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4433335 + ... + 4433591.

Almost surely, 2^1139399991 is an apocalyptic number.

1139399991 is a deficient number, since it is larger than the sum of its proper divisors (556275081).

1139399991 is a wasteful number, since it uses less digits than its factorization.

1139399991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 530 counting only the distinct ones).

The product of its digits is 531441, while the sum is 54.

The square root of 1139399991 is about 33754.9994963709. Note that the first 3 decimals coincide. The cubic root of 1139399991 is about 1044.4606210457.

The spelling of 1139399991 in words is "one billion, one hundred thirty-nine million, three hundred ninety-nine thousand, nine hundred ninety-one".