801122521 has 4 divisors (see below), whose sum is σ = 801597412. Its totient is φ = 800647632.

The previous prime is 801122519. The next prime is 801122533. The reversal of 801122521 is 125221108.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 598487296 + 202635225 = 24464^2 + 14235^2 .

It is a cyclic number.

It is not a de Polignac number, because 801122521 - 2¹ = 801122519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 801122492 and 801122501.

It is not an unprimeable number, because it can be changed into a prime (801122921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234906 + ... + 238291.

It is an arithmetic number, because the mean of its divisors is an integer number (200399353).

Almost surely, 2^801122521 is an apocalyptic number.

It is an amenable number.

801122521 is a deficient number, since it is larger than the sum of its proper divisors (474891).

801122521 is a wasteful number, since it uses less digits than its factorization.

801122521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474890.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 801122521 is about 28304.1078467420. The cubic root of 801122521 is about 928.7517538809.

Adding to 801122521 its reverse (125221108), we get a palindrome (926343629).

The spelling of 801122521 in words is "eight hundred one million, one hundred twenty-two thousand, five hundred twenty-one".