525128242 has 4 divisors (see below), whose sum is σ = 787692366. Its totient is φ = 262564120.

The previous prime is 525128237. The next prime is 525128257. The reversal of 525128242 is 242821525.

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

It can be written as a sum of positive squares in only one way, i.e., 454585041 + 70543201 = 21321^2 + 8399^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131282059 + ... + 131282062.

Almost surely, 2^525128242 is an apocalyptic number.

525128242 is a deficient number, since it is larger than the sum of its proper divisors (262564124).

525128242 is a wasteful number, since it uses less digits than its factorization.

525128242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262564123.

The product of its digits is 12800, while the sum is 31.

The square root of 525128242 is about 22915.6767737721. The cubic root of 525128242 is about 806.7800031619.

Adding to 525128242 its reverse (242821525), we get a palindrome (767949767).

The spelling of 525128242 in words is "five hundred twenty-five million, one hundred twenty-eight thousand, two hundred forty-two".