7531721705 has 8 divisors (see below), whose sum is σ = 9146958912. Its totient is φ = 5952782128.

The previous prime is 7531721699. The next prime is 7531721707. The reversal of 7531721705 is 5071271357.

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 7531721705 - 2¹⁶ = 7531656169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7531721707) 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 7 ways as a sum of consecutive naturals, for example, 9073949 + ... + 9074778.

It is an arithmetic number, because the mean of its divisors is an integer number (1143369864).

Almost surely, 2^7531721705 is an apocalyptic number.

It is an amenable number.

7531721705 is a deficient number, since it is larger than the sum of its proper divisors (1615237207).

7531721705 is a wasteful number, since it uses less digits than its factorization.

7531721705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18148815.

The product of its (nonzero) digits is 51450, while the sum is 38.

The square root of 7531721705 is about 86785.4924800223. The cubic root of 7531721705 is about 1960.1896339669.

The spelling of 7531721705 in words is "seven billion, five hundred thirty-one million, seven hundred twenty-one thousand, seven hundred five".