1621039841 has 2 divisors, whose sum is σ = 1621039842. Its totient is φ = 1621039840.

The previous prime is 1621039831. The next prime is 1621039873. The reversal of 1621039841 is 1489301261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1522950625 + 98089216 = 39025^2 + 9904^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621039841 - 2¹⁰ = 1621038817 is a prime.

It is a super-2 number, since 2×1621039841² = 5255540332218610562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1621039831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810519920 + 810519921.

It is an arithmetic number, because the mean of its divisors is an integer number (810519921).

Almost surely, 2^1621039841 is an apocalyptic number.

It is an amenable number.

1621039841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621039841 is an equidigital number, since it uses as much as digits as its factorization.

1621039841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1621039841 is about 40262.1390514712. The cubic root of 1621039841 is about 1174.7115250173.

The spelling of 1621039841 in words is "one billion, six hundred twenty-one million, thirty-nine thousand, eight hundred forty-one".