6250641721 has 9 divisors (see below), whose sum is σ = 6300768621. Its totient is φ = 6200912352.

The previous prime is 6250641703. The next prime is 6250641739. The reversal of 6250641721 is 1271460526.

The square root of 6250641721 is 79061.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (6250641703) and next prime (6250641739).

It can be written as a sum of positive squares in 4 ways, for example, as 3768609321 + 2482032400 = 61389^2 + 49820^2 .

It is not a de Polignac number, because 6250641721 - 2⁵ = 6250641689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6250641781) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13677325 + ... + 13677781.

Almost surely, 2^6250641721 is an apocalyptic number.

6250641721 is the 79061-st square number.

6250641721 is the 39531-st centered octagonal number.

It is an amenable number.

6250641721 is a deficient number, since it is larger than the sum of its proper divisors (50126900).

6250641721 is an frugal number, since it uses more digits than its factorization.

6250641721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The cubic root of 6250641721 is about 1842.0787903727.

The spelling of 6250641721 in words is "six billion, two hundred fifty million, six hundred forty-one thousand, seven hundred twenty-one".