791641621 has 2 divisors, whose sum is σ = 791641622. Its totient is φ = 791641620.

The previous prime is 791641597. The next prime is 791641639. The reversal of 791641621 is 126146197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617771025 + 173870596 = 24855^2 + 13186^2 .

It is a cyclic number.

It is not a de Polignac number, because 791641621 - 2⁵ = 791641589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (791641651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395820810 + 395820811.

It is an arithmetic number, because the mean of its divisors is an integer number (395820811).

Almost surely, 2^791641621 is an apocalyptic number.

It is an amenable number.

791641621 is a deficient number, since it is larger than the sum of its proper divisors (1).

791641621 is an equidigital number, since it uses as much as digits as its factorization.

791641621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 791641621 is about 28136.1266168604. The cubic root of 791641621 is about 925.0734282104.

The spelling of 791641621 in words is "seven hundred ninety-one million, six hundred forty-one thousand, six hundred twenty-one".