1145749281 has 8 divisors (see below), whose sum is σ = 1531211904. Its totient is φ = 762059760.

The previous prime is 1145749271. The next prime is 1145749303. The reversal of 1145749281 is 1829475411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1145749281 - 2¹¹ = 1145747233 is a prime.

It is a super-3 number, since 3×1145749281³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1145749271) 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, 441766 + ... + 444351.

It is an arithmetic number, because the mean of its divisors is an integer number (191401488).

Almost surely, 2^1145749281 is an apocalyptic number.

It is an amenable number.

1145749281 is a deficient number, since it is larger than the sum of its proper divisors (385462623).

1145749281 is an equidigital number, since it uses as much as digits as its factorization.

1145749281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886551.

The product of its digits is 80640, while the sum is 42.

The square root of 1145749281 is about 33848.9184613039. The cubic root of 1145749281 is about 1046.3971090477.

The spelling of 1145749281 in words is "one billion, one hundred forty-five million, seven hundred forty-nine thousand, two hundred eighty-one".