525148681 has 4 divisors (see below), whose sum is σ = 527402772. Its totient is φ = 522894592.

The previous prime is 525148661. The next prime is 525148697. The reversal of 525148681 is 186841525.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105267600 + 419881081 = 10260^2 + 20491^2 .

It is a cyclic number.

It is not a de Polignac number, because 525148681 - 2²³ = 516760073 is a prime.

It is a super-2 number, since 2×525148681² = 551562274312079522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525148601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1126696 + ... + 1127161.

It is an arithmetic number, because the mean of its divisors is an integer number (131850693).

Almost surely, 2^525148681 is an apocalyptic number.

It is an amenable number.

525148681 is a deficient number, since it is larger than the sum of its proper divisors (2254091).

525148681 is a wasteful number, since it uses less digits than its factorization.

525148681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254090.

The product of its digits is 76800, while the sum is 40.

The square root of 525148681 is about 22916.1227305144. The cubic root of 525148681 is about 806.7904701687.

The spelling of 525148681 in words is "five hundred twenty-five million, one hundred forty-eight thousand, six hundred eighty-one".