525278385 has 16 divisors (see below), whose sum is σ = 933828480. Its totient is φ = 280148400.

The previous prime is 525278371. The next prime is 525278399. The reversal of 525278385 is 583872525.

It is an interprime number because it is at equal distance from previous prime (525278371) and next prime (525278399).

It is not a de Polignac number, because 525278385 - 2⁸ = 525278129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 525278385.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1945341 + ... + 1945610.

It is an arithmetic number, because the mean of its divisors is an integer number (58364280).

Almost surely, 2^525278385 is an apocalyptic number.

It is an amenable number.

525278385 is a deficient number, since it is larger than the sum of its proper divisors (408550095).

525278385 is a wasteful number, since it uses less digits than its factorization.

525278385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890965 (or 3890959 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The square root of 525278385 is about 22918.9525284207. The cubic root of 525278385 is about 806.8568864941.

The spelling of 525278385 in words is "five hundred twenty-five million, two hundred seventy-eight thousand, three hundred eighty-five".