5250777721 has 6 divisors (see below), whose sum is σ = 6108047610. Its totient is φ = 4500666576.

The previous prime is 5250777689. The next prime is 5250777733. The reversal of 5250777721 is 1277770525.

It can be written as a sum of positive squares in only one way, i.e., 3923268496 + 1327509225 = 62636^2 + 36435^2 .

It is not a de Polignac number, because 5250777721 - 2⁵ = 5250777689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5250777421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53579316 + ... + 53579413.

It is an arithmetic number, because the mean of its divisors is an integer number (1018007935).

Almost surely, 2^5250777721 is an apocalyptic number.

It is an amenable number.

5250777721 is a deficient number, since it is larger than the sum of its proper divisors (857269889).

5250777721 is a wasteful number, since it uses less digits than its factorization.

5250777721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107158743 (or 107158736 counting only the distinct ones).

The product of its (nonzero) digits is 240100, while the sum is 43.

The square root of 5250777721 is about 72462.2503169754. The cubic root of 5250777721 is about 1738.0991397587.

The spelling of 5250777721 in words is "five billion, two hundred fifty million, seven hundred seventy-seven thousand, seven hundred twenty-one".