801521017 has 4 divisors (see below), whose sum is σ = 874386576. Its totient is φ = 728655460.

The previous prime is 801520999. The next prime is 801521081. The reversal of 801521017 is 710125108.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 801521017 - 2¹¹ = 801518969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 801520982 and 801521000.

It is not an unprimeable number, because it can be changed into a prime (801527017) 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 in 3 ways as a sum of consecutive naturals, for example, 36432763 + ... + 36432784.

It is an arithmetic number, because the mean of its divisors is an integer number (218596644).

Almost surely, 2^801521017 is an apocalyptic number.

It is an amenable number.

801521017 is a deficient number, since it is larger than the sum of its proper divisors (72865559).

801521017 is a wasteful number, since it uses less digits than its factorization.

801521017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72865558.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 801521017 is about 28311.1465151096. The cubic root of 801521017 is about 928.9057222191.

The spelling of 801521017 in words is "eight hundred one million, five hundred twenty-one thousand, seventeen".