9721557151 has 8 divisors (see below), whose sum is σ = 10295434800. Its totient is φ = 9147904128.

The previous prime is 9721557149. The next prime is 9721557163. The reversal of 9721557151 is 1517551279.

9721557151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9721557151 - 2¹ = 9721557149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9721557098 and 9721557107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721557101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37425 + ... + 144373.

It is an arithmetic number, because the mean of its divisors is an integer number (1286929350).

Almost surely, 2^9721557151 is an apocalyptic number.

9721557151 is a deficient number, since it is larger than the sum of its proper divisors (573877649).

9721557151 is a wasteful number, since it uses less digits than its factorization.

9721557151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112313.

The product of its digits is 110250, while the sum is 43.

The square root of 9721557151 is about 98597.9571340096. The cubic root of 9721557151 is about 2134.2499399827.

The spelling of 9721557151 in words is "nine billion, seven hundred twenty-one million, five hundred fifty-seven thousand, one hundred fifty-one".