1145721141 has 12 divisors (see below), whose sum is σ = 1655724460. Its totient is φ = 763447680.

The previous prime is 1145721133. The next prime is 1145721151. The reversal of 1145721141 is 1411275411.

It can be written as a sum of positive squares in 2 ways, for example, as 258277041 + 887444100 = 16071^2 + 29790^2 .

It is not a de Polignac number, because 1145721141 - 2³ = 1145721133 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 (1145721151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10006 + ... + 48903.

Almost surely, 2^1145721141 is an apocalyptic number.

It is an amenable number.

1145721141 is a deficient number, since it is larger than the sum of its proper divisors (510003319).

1145721141 is a wasteful number, since it uses less digits than its factorization.

1145721141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61076 (or 61073 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 1145721141 is about 33848.5027881589. The cubic root of 1145721141 is about 1046.3885423522.

Adding to 1145721141 its reverse (1411275411), we get a palindrome (2556996552).

The spelling of 1145721141 in words is "one billion, one hundred forty-five million, seven hundred twenty-one thousand, one hundred forty-one".