1145888021 has 2 divisors, whose sum is σ = 1145888022. Its totient is φ = 1145888020.

The previous prime is 1145888017. The next prime is 1145888057. The reversal of 1145888021 is 1208885411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1095279025 + 50608996 = 33095^2 + 7114^2 .

It is an emirp because it is prime and its reverse (1208885411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1145888021 - 2² = 1145888017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145888321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572944010 + 572944011.

It is an arithmetic number, because the mean of its divisors is an integer number (572944011).

Almost surely, 2^1145888021 is an apocalyptic number.

It is an amenable number.

1145888021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145888021 is an equidigital number, since it uses as much as digits as its factorization.

1145888021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20480, while the sum is 38.

The square root of 1145888021 is about 33850.9678000497. The cubic root of 1145888021 is about 1046.4393437896.

The spelling of 1145888021 in words is "one billion, one hundred forty-five million, eight hundred eighty-eight thousand, twenty-one".