801560721 has 16 divisors (see below), whose sum is σ = 1177727936. Its totient is φ = 481795776.

The previous prime is 801560713. The next prime is 801560743. The reversal of 801560721 is 127065108.

It is not a de Polignac number, because 801560721 - 2³ = 801560713 is a prime.

It is a super-3 number, since 3×801560721³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801560791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237310 + ... + 240663.

It is an arithmetic number, because the mean of its divisors is an integer number (73607996).

Almost surely, 2^801560721 is an apocalyptic number.

It is an amenable number.

801560721 is a deficient number, since it is larger than the sum of its proper divisors (376167215).

801560721 is a wasteful number, since it uses less digits than its factorization.

801560721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478032.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 801560721 is about 28311.8477143404. The cubic root of 801560721 is about 928.9210600011.

The spelling of 801560721 in words is "eight hundred one million, five hundred sixty thousand, seven hundred twenty-one".