1881824621 has 2 divisors, whose sum is σ = 1881824622. Its totient is φ = 1881824620.

The previous prime is 1881824611. The next prime is 1881824629. The reversal of 1881824621 is 1264281881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1615155721 + 266668900 = 40189^2 + 16330^2 .

It is an emirp because it is prime and its reverse (1264281881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881824621 - 2¹⁴ = 1881808237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881824629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940912310 + 940912311.

It is an arithmetic number, because the mean of its divisors is an integer number (940912311).

Almost surely, 2^1881824621 is an apocalyptic number.

It is an amenable number.

1881824621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881824621 is an equidigital number, since it uses as much as digits as its factorization.

1881824621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49152, while the sum is 41.

The square root of 1881824621 is about 43380.0025472567. The cubic root of 1881824621 is about 1234.6003112516.

The spelling of 1881824621 in words is "one billion, eight hundred eighty-one million, eight hundred twenty-four thousand, six hundred twenty-one".