1845884921 has 2 divisors, whose sum is σ = 1845884922. Its totient is φ = 1845884920.

The previous prime is 1845884917. The next prime is 1845884923. The reversal of 1845884921 is 1294885481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1626992896 + 218892025 = 40336^2 + 14795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1845884921 - 2² = 1845884917 is a prime.

It is a super-2 number, since 2×1845884921² = 6814582283150352482, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1845884923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1845884921.

It is not a weakly prime, because it can be changed into another prime (1845884923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 922942460 + 922942461.

It is an arithmetic number, because the mean of its divisors is an integer number (922942461).

Almost surely, 2^1845884921 is an apocalyptic number.

It is an amenable number.

1845884921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1845884921 is an equidigital number, since it uses as much as digits as its factorization.

1845884921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 737280, while the sum is 50.

The square root of 1845884921 is about 42963.7628822244. The cubic root of 1845884921 is about 1226.6901387269.

The spelling of 1845884921 in words is "one billion, eight hundred forty-five million, eight hundred eighty-four thousand, nine hundred twenty-one".