1145993721 has 16 divisors (see below), whose sum is σ = 1609800000. Its totient is φ = 723161088.

The previous prime is 1145993713. The next prime is 1145993741. The reversal of 1145993721 is 1273995411.

It is not a de Polignac number, because 1145993721 - 2³ = 1145993713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1145993741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63145 + ... + 79241.

It is an arithmetic number, because the mean of its divisors is an integer number (100612500).

Almost surely, 2^1145993721 is an apocalyptic number.

It is an amenable number.

1145993721 is a deficient number, since it is larger than the sum of its proper divisors (463806279).

1145993721 is a wasteful number, since it uses less digits than its factorization.

1145993721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17368.

The product of its digits is 68040, while the sum is 42.

The square root of 1145993721 is about 33852.5290192624. The cubic root of 1145993721 is about 1046.4715183232.

The spelling of 1145993721 in words is "one billion, one hundred forty-five million, nine hundred ninety-three thousand, seven hundred twenty-one".