1145332721 has 24 divisors (see below), whose sum is σ = 1332723840. Its totient is φ = 977985792.

The previous prime is 1145332709. The next prime is 1145332733. The reversal of 1145332721 is 1272335411.

It is an interprime number because it is at equal distance from previous prime (1145332709) and next prime (1145332733).

It is not a de Polignac number, because 1145332721 - 2¹⁰ = 1145331697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1145331721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219080 + ... + 224246.

It is an arithmetic number, because the mean of its divisors is an integer number (55530160).

Almost surely, 2^1145332721 is an apocalyptic number.

It is an amenable number.

1145332721 is a deficient number, since it is larger than the sum of its proper divisors (187391119).

1145332721 is a wasteful number, since it uses less digits than its factorization.

1145332721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273 (or 5256 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 1145332721 is about 33842.7646772541. The cubic root of 1145332721 is about 1046.2702808307.

The spelling of 1145332721 in words is "one billion, one hundred forty-five million, three hundred thirty-two thousand, seven hundred twenty-one".