5251221526 has 4 divisors (see below), whose sum is σ = 7876832292. Its totient is φ = 2625610762.

The previous prime is 5251221523. The next prime is 5251221571. The reversal of 5251221526 is 6251221525.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5251221523) 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 as a sum of consecutive naturals, namely, 1312805380 + ... + 1312805383.

It is an arithmetic number, because the mean of its divisors is an integer number (1969208073).

Almost surely, 2^5251221526 is an apocalyptic number.

5251221526 is a deficient number, since it is larger than the sum of its proper divisors (2625610766).

5251221526 is a wasteful number, since it uses less digits than its factorization.

5251221526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625610765.

The product of its digits is 12000, while the sum is 31.

The square root of 5251221526 is about 72465.3125709122. The cubic root of 5251221526 is about 1738.1481074481.

Subtracting 5251221526 from its reverse (6251221525), we obtain a palindrome (999999999).

The spelling of 5251221526 in words is "five billion, two hundred fifty-one million, two hundred twenty-one thousand, five hundred twenty-six".