1145231999 has 8 divisors (see below), whose sum is σ = 1156446720. Its totient is φ = 1134055000.

The previous prime is 1145231963. The next prime is 1145232007. The reversal of 1145231999 is 9991325411.

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 1145231999 - 2⁸ = 1145231743 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 (1145231929) 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, 53624 + ... + 71874.

It is an arithmetic number, because the mean of its divisors is an integer number (144555840).

Almost surely, 2^1145231999 is an apocalyptic number.

1145231999 is a deficient number, since it is larger than the sum of its proper divisors (11214721).

1145231999 is a wasteful number, since it uses less digits than its factorization.

1145231999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18861.

The product of its digits is 87480, while the sum is 44.

The square root of 1145231999 is about 33841.2765568913. The cubic root of 1145231999 is about 1046.2396098234.

The spelling of 1145231999 in words is "one billion, one hundred forty-five million, two hundred thirty-one thousand, nine hundred ninety-nine".