4251525721 has 8 divisors (see below), whose sum is σ = 4409477888. Its totient is φ = 4094874000.

The previous prime is 4251525667. The next prime is 4251525739. The reversal of 4251525721 is 1275251524.

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 4251525721 - 2¹¹ = 4251523673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4251523721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318450 + ... + 331531.

It is an arithmetic number, because the mean of its divisors is an integer number (551184736).

Almost surely, 2^4251525721 is an apocalyptic number.

It is an amenable number.

4251525721 is a deficient number, since it is larger than the sum of its proper divisors (157952167).

4251525721 is a wasteful number, since it uses less digits than its factorization.

4251525721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650223.

The product of its digits is 28000, while the sum is 34.

The square root of 4251525721 is about 65203.7247479007. The cubic root of 4251525721 is about 1619.9997105370. Note that the first 3 decimals are identical.

The spelling of 4251525721 in words is "four billion, two hundred fifty-one million, five hundred twenty-five thousand, seven hundred twenty-one".