425645871 has 8 divisors (see below), whose sum is σ = 648603264. Its totient is φ = 243226200.

The previous prime is 425645851. The next prime is 425645911. The reversal of 425645871 is 178546524.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 425645871 - 2⁶ = 425645807 is a prime.

It is a super-3 number, since 3×425645871³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425645851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10134405 + ... + 10134446.

It is an arithmetic number, because the mean of its divisors is an integer number (81075408).

Almost surely, 2^425645871 is an apocalyptic number.

425645871 is a deficient number, since it is larger than the sum of its proper divisors (222957393).

425645871 is a wasteful number, since it uses less digits than its factorization.

425645871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20268861.

The product of its digits is 268800, while the sum is 42.

The square root of 425645871 is about 20631.1868538870. The cubic root of 425645871 is about 752.2279652298.

The spelling of 425645871 in words is "four hundred twenty-five million, six hundred forty-five thousand, eight hundred seventy-one".