7531721579 has 2 divisors, whose sum is σ = 7531721580. Its totient is φ = 7531721578.

The previous prime is 7531721557. The next prime is 7531721597. The reversal of 7531721579 is 9751271357.

It is a happy number.

Together with next prime (7531721597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (9751271357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7531721579 - 2²⁴ = 7514944363 is a prime.

It is not a weakly prime, because it can be changed into another prime (7531721479) 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 as a sum of consecutive naturals, namely, 3765860789 + 3765860790.

It is an arithmetic number, because the mean of its divisors is an integer number (3765860790).

Almost surely, 2^7531721579 is an apocalyptic number.

7531721579 is a deficient number, since it is larger than the sum of its proper divisors (1).

7531721579 is an equidigital number, since it uses as much as digits as its factorization.

7531721579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 463050, while the sum is 47.

The square root of 7531721579 is about 86785.4917540945. The cubic root of 7531721579 is about 1960.1896230361.

The spelling of 7531721579 in words is "seven billion, five hundred thirty-one million, seven hundred twenty-one thousand, five hundred seventy-nine".