7283151721 has 4 divisors (see below), whose sum is σ = 7420569732. Its totient is φ = 7145733712.

The previous prime is 7283151697. The next prime is 7283151731. The reversal of 7283151721 is 1271513827.

7283151721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6367242025 + 915909696 = 79795^2 + 30264^2 .

It is a cyclic number.

It is not a de Polignac number, because 7283151721 - 2²¹ = 7281054569 is a prime.

It is a super-2 number, since 2×7283151721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7283151731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68708926 + ... + 68709031.

It is an arithmetic number, because the mean of its divisors is an integer number (1855142433).

Almost surely, 2^7283151721 is an apocalyptic number.

It is an amenable number.

7283151721 is a deficient number, since it is larger than the sum of its proper divisors (137418011).

7283151721 is a wasteful number, since it uses less digits than its factorization.

7283151721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137418010.

The product of its digits is 23520, while the sum is 37.

The square root of 7283151721 is about 85341.3834021924. The cubic root of 7283151721 is about 1938.3838633202.

The spelling of 7283151721 in words is "seven billion, two hundred eighty-three million, one hundred fifty-one thousand, seven hundred twenty-one".