7001958721 has 4 divisors (see below), whose sum is σ = 7172738244. Its totient is φ = 6831179200.

The previous prime is 7001958713. The next prime is 7001958757. The reversal of 7001958721 is 1278591007.

7001958721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 3814791696 + 3187167025 = 61764^2 + 56455^2 .

It is a cyclic number.

It is not a de Polignac number, because 7001958721 - 2³ = 7001958713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7001958791) 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, 85389700 + ... + 85389781.

It is an arithmetic number, because the mean of its divisors is an integer number (1793184561).

Almost surely, 2^7001958721 is an apocalyptic number.

It is an amenable number.

7001958721 is a deficient number, since it is larger than the sum of its proper divisors (170779523).

7001958721 is a wasteful number, since it uses less digits than its factorization.

7001958721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170779522.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 7001958721 is about 83677.7074315495. The cubic root of 7001958721 is about 1913.1095898701.

The spelling of 7001958721 in words is "seven billion, one million, nine hundred fifty-eight thousand, seven hundred twenty-one".