7721547349 has 4 divisors (see below), whose sum is σ = 7722103500. Its totient is φ = 7720991200.

The previous prime is 7721547331. The next prime is 7721547413. The reversal of 7721547349 is 9437451277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9437451277 = 409 ⋅23074453.

It can be written as a sum of positive squares in 2 ways, for example, as 1936880100 + 5784667249 = 44010^2 + 76057^2 .

It is a cyclic number.

It is not a de Polignac number, because 7721547349 - 2¹⁷ = 7721416277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721547049) 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 3 ways as a sum of consecutive naturals, for example, 256702 + ... + 285199.

It is an arithmetic number, because the mean of its divisors is an integer number (1930525875).

Almost surely, 2^7721547349 is an apocalyptic number.

It is an amenable number.

7721547349 is a deficient number, since it is larger than the sum of its proper divisors (556151).

7721547349 is a wasteful number, since it uses less digits than its factorization.

7721547349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556150.

The product of its digits is 1481760, while the sum is 49.

The square root of 7721547349 is about 87872.3355157925. The cubic root of 7721547349 is about 1976.5210607060.

The spelling of 7721547349 in words is "seven billion, seven hundred twenty-one million, five hundred forty-seven thousand, three hundred forty-nine".