1147391999 has 8 divisors (see below), whose sum is σ = 1308338640. Its totient is φ = 996829056.

The previous prime is 1147391983. The next prime is 1147392013. The reversal of 1147391999 is 9991937411.

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 1147391999 - 2⁴ = 1147391983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1147391999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1147391909) 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, 2595689 + ... + 2596130.

It is an arithmetic number, because the mean of its divisors is an integer number (163542330).

Almost surely, 2^1147391999 is an apocalyptic number.

1147391999 is a deficient number, since it is larger than the sum of its proper divisors (160946641).

1147391999 is a wasteful number, since it uses less digits than its factorization.

1147391999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191849.

The product of its digits is 551124, while the sum is 53.

The square root of 1147391999 is about 33873.1752128436. The cubic root of 1147391999 is about 1046.8969608450.

The spelling of 1147391999 in words is "one billion, one hundred forty-seven million, three hundred ninety-one thousand, nine hundred ninety-nine".