1145005921 has 2 divisors, whose sum is σ = 1145005922. Its totient is φ = 1145005920.

The previous prime is 1145005919. The next prime is 1145005937. The reversal of 1145005921 is 1295005411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000140625 + 144865296 = 31625^2 + 12036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145005921 - 2¹ = 1145005919 is a prime.

It is a super-2 number, since 2×1145005921² = 2622077118250116482, which contains 22 as substring.

Together with 1145005919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1145005921.

It is not a weakly prime, because it can be changed into another prime (1145005321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572502960 + 572502961.

It is an arithmetic number, because the mean of its divisors is an integer number (572502961).

Almost surely, 2^1145005921 is an apocalyptic number.

It is an amenable number.

1145005921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145005921 is an equidigital number, since it uses as much as digits as its factorization.

1145005921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1145005921 is about 33837.9361220509. The cubic root of 1145005921 is about 1046.1707599238.

The spelling of 1145005921 in words is "one billion, one hundred forty-five million, five thousand, nine hundred twenty-one".