5251221524 has 6 divisors (see below), whose sum is σ = 9189637674. Its totient is φ = 2625610760.

The previous prime is 5251221523. The next prime is 5251221571. The reversal of 5251221524 is 4251221525.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4099840900 + 1151380624 = 64030^2 + 33932^2 .

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 polite number, since it can be written as a sum of consecutive naturals, namely, 656402687 + ... + 656402694.

It is an arithmetic number, because the mean of its divisors is an integer number (1531606279).

Almost surely, 2^5251221524 is an apocalyptic number.

It is an amenable number.

5251221524 is a deficient number, since it is larger than the sum of its proper divisors (3938416150).

5251221524 is a wasteful number, since it uses less digits than its factorization.

5251221524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312805385 (or 1312805383 counting only the distinct ones).

The product of its digits is 8000, while the sum is 29.

The square root of 5251221524 is about 72465.3125571125. The cubic root of 5251221524 is about 1738.1481072274.

Subtracting from 5251221524 its reverse (4251221525), we obtain a palindrome (999999999).

The spelling of 5251221524 in words is "five billion, two hundred fifty-one million, two hundred twenty-one thousand, five hundred twenty-four".