699201721 has 8 divisors (see below), whose sum is σ = 745302600. Its totient is φ = 653653248.

The previous prime is 699201719. The next prime is 699201731. The reversal of 699201721 is 127102996.

It can be written as a sum of positive squares in 4 ways, for example, as 2822400 + 696379321 = 1680^2 + 26389^2 .

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 699201721 - 2¹ = 699201719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699201731) 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, 135486 + ... + 140551.

It is an arithmetic number, because the mean of its divisors is an integer number (93162825).

Almost surely, 2^699201721 is an apocalyptic number.

It is an amenable number.

699201721 is a deficient number, since it is larger than the sum of its proper divisors (46100879).

699201721 is a wasteful number, since it uses less digits than its factorization.

699201721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276203.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 699201721 is about 26442.4227520853. The cubic root of 699201721 is about 887.5663518732.

The spelling of 699201721 in words is "six hundred ninety-nine million, two hundred one thousand, seven hundred twenty-one".