1145841821 has 8 divisors (see below), whose sum is σ = 1168647480. Its totient is φ = 1123080192.

The previous prime is 1145841817. The next prime is 1145841847. The reversal of 1145841821 is 1281485411.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 625500100 + 520341721 = 25010^2 + 22811^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1145841821 - 2² = 1145841817 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 (1145843821) 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, 44285 + ... + 65213.

It is an arithmetic number, because the mean of its divisors is an integer number (146080935).

Almost surely, 2^1145841821 is an apocalyptic number.

It is an amenable number.

1145841821 is a deficient number, since it is larger than the sum of its proper divisors (22805659).

1145841821 is a wasteful number, since it uses less digits than its factorization.

1145841821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22015.

The product of its digits is 10240, while the sum is 35.

The square root of 1145841821 is about 33850.2853902297. The cubic root of 1145841821 is about 1046.4252801270.

The spelling of 1145841821 in words is "one billion, one hundred forty-five million, eight hundred forty-one thousand, eight hundred twenty-one".