1625440523 has 4 divisors (see below), whose sum is σ = 1857646320. Its totient is φ = 1393234728.

The previous prime is 1625440513. The next prime is 1625440529. The reversal of 1625440523 is 3250445261.

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

It is a cyclic number.

It is not a de Polignac number, because 1625440523 - 2⁴ = 1625440507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1625440523.

It is not an unprimeable number, because it can be changed into a prime (1625440529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116102888 + ... + 116102901.

It is an arithmetic number, because the mean of its divisors is an integer number (464411580).

Almost surely, 2^1625440523 is an apocalyptic number.

1625440523 is a deficient number, since it is larger than the sum of its proper divisors (232205797).

1625440523 is an equidigital number, since it uses as much as digits as its factorization.

1625440523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232205796.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 1625440523 is about 40316.7523865700. The cubic root of 1625440523 is about 1175.7735719039.

Adding to 1625440523 its reverse (3250445261), we get a palindrome (4875885784).

The spelling of 1625440523 in words is "one billion, six hundred twenty-five million, four hundred forty thousand, five hundred twenty-three".