5125557649 has 3 divisors (see below), whose sum is σ = 5125629243. Its totient is φ = 5125486056.

The previous prime is 5125557611. The next prime is 5125557653. The reversal of 5125557649 is 9467555215.

The square root of 5125557649 is 71593.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2162715025 + 2962842624 = 46505^2 + 54432^2 .

It is not a de Polignac number, because 5125557649 - 2¹⁵ = 5125524881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5125557449) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 35797 + ... + 107389.

It is an arithmetic number, because the mean of its divisors is an integer number (1708543081).

Almost surely, 2^5125557649 is an apocalyptic number.

5125557649 is the 71593-rd square number.

5125557649 is the 35797-th centered octagonal number.

It is an amenable number.

5125557649 is a deficient number, since it is larger than the sum of its proper divisors (71594).

5125557649 is an frugal number, since it uses more digits than its factorization.

5125557649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143186 (or 71593 counting only the distinct ones).

The product of its digits is 1890000, while the sum is 49.

The cubic root of 5125557649 is about 1724.1711510908.

Multiplying 5125557649 by its sum of digits (49), we get a square (251152324801 = 501151²).

The spelling of 5125557649 in words is "five billion, one hundred twenty-five million, five hundred fifty-seven thousand, six hundred forty-nine".