7261191521 has 32 divisors (see below), whose sum is σ = 7940851200. Its totient is φ = 6614562816.

The previous prime is 7261191479. The next prime is 7261191557. The reversal of 7261191521 is 1251911627.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7261191521 - 2¹⁴ = 7261175137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7261101521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19785080 + ... + 19785446.

It is an arithmetic number, because the mean of its divisors is an integer number (248151600).

Almost surely, 2^7261191521 is an apocalyptic number.

It is an amenable number.

7261191521 is a deficient number, since it is larger than the sum of its proper divisors (679659679).

7261191521 is a wasteful number, since it uses less digits than its factorization.

7261191521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713.

The product of its digits is 7560, while the sum is 35.

The square root of 7261191521 is about 85212.6253615038. The cubic root of 7261191521 is about 1936.4336933110.

The spelling of 7261191521 in words is "seven billion, two hundred sixty-one million, one hundred ninety-one thousand, five hundred twenty-one".