801621 has 6 divisors (see below), whose sum is σ = 1157910. Its totient is φ = 534408.

The previous prime is 801617. The next prime is 801631. The reversal of 801621 is 126108.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 239121 = 750^2 + 489^2 .

It is not a de Polignac number, because 801621 - 2² = 801617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 801594 and 801603.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 801621.

It is not an unprimeable number, because it can be changed into a prime (801611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44526 + ... + 44543.

It is an arithmetic number, because the mean of its divisors is an integer number (192985).

2⁸⁰¹⁶²¹ is an apocalyptic number.

It is an amenable number.

801621 is a deficient number, since it is larger than the sum of its proper divisors (356289).

801621 is a wasteful number, since it uses less digits than its factorization.

801621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89075 (or 89072 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 801621 is about 895.3328989823. The cubic root of 801621 is about 92.8944345003.

Adding to 801621 its reverse (126108), we get a palindrome (927729).

The spelling of 801621 in words is "eight hundred one thousand, six hundred twenty-one".