425635521 has 4 divisors (see below), whose sum is σ = 567514032. Its totient is φ = 283757012.

The previous prime is 425635519. The next prime is 425635577. The reversal of 425635521 is 125536524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 425635521 - 2¹ = 425635519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (425635591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70939251 + ... + 70939256.

It is an arithmetic number, because the mean of its divisors is an integer number (141878508).

Almost surely, 2^425635521 is an apocalyptic number.

It is an amenable number.

425635521 is a deficient number, since it is larger than the sum of its proper divisors (141878511).

425635521 is a wasteful number, since it uses less digits than its factorization.

425635521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141878510.

The product of its digits is 36000, while the sum is 33.

The square root of 425635521 is about 20630.9360185136. The cubic root of 425635521 is about 752.2218681250.

It can be divided in two parts, 42563 and 5521, that added together give a palindrome (48084).

The spelling of 425635521 in words is "four hundred twenty-five million, six hundred thirty-five thousand, five hundred twenty-one".