1145250281 has 16 divisors (see below), whose sum is σ = 1371148800. Its totient is φ = 935782848.

The previous prime is 1145250257. The next prime is 1145250287. The reversal of 1145250281 is 1820525411.

It is not a de Polignac number, because 1145250281 - 2¹⁰ = 1145249257 is a prime.

It is a super-3 number, since 3×1145250281³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (1145250287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19670 + ... + 51743.

It is an arithmetic number, because the mean of its divisors is an integer number (85696800).

Almost surely, 2^1145250281 is an apocalyptic number.

It is an amenable number.

1145250281 is a deficient number, since it is larger than the sum of its proper divisors (225898519).

1145250281 is an equidigital number, since it uses as much as digits as its factorization.

1145250281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71528.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 1145250281 is about 33841.5466697372. The cubic root of 1145250281 is about 1046.2451770362.

Adding to 1145250281 its reverse (1820525411), we get a palindrome (2965775692).

The spelling of 1145250281 in words is "one billion, one hundred forty-five million, two hundred fifty thousand, two hundred eighty-one".