846501721 has 4 divisors (see below), whose sum is σ = 911617252. Its totient is φ = 781386192.

The previous prime is 846501707. The next prime is 846501731. The reversal of 846501721 is 127105648.

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 97713225 + 748788496 = 9885^2 + 27364^2 .

It is a cyclic number.

It is not a de Polignac number, because 846501721 - 2¹¹ = 846499673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (846501731) 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, 32557746 + ... + 32557771.

It is an arithmetic number, because the mean of its divisors is an integer number (227904313).

Almost surely, 2^846501721 is an apocalyptic number.

It is an amenable number.

846501721 is a deficient number, since it is larger than the sum of its proper divisors (65115531).

846501721 is a wasteful number, since it uses less digits than its factorization.

846501721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65115530.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 846501721 is about 29094.7026277981. The cubic root of 846501721 is about 945.9669175260.

The spelling of 846501721 in words is "eight hundred forty-six million, five hundred one thousand, seven hundred twenty-one".