425516781 has 16 divisors (see below), whose sum is σ = 577773056. Its totient is φ = 278505216.

The previous prime is 425516779. The next prime is 425516827. The reversal of 425516781 is 187615524.

It is not a de Polignac number, because 425516781 - 2¹ = 425516779 is a prime.

It is a super-2 number, since 2×425516781² = 362129061825203922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) 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 a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425516711) 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 15 ways as a sum of consecutive naturals, for example, 44481 + ... + 53193.

It is an arithmetic number, because the mean of its divisors is an integer number (36110816).

Almost surely, 2^425516781 is an apocalyptic number.

It is an amenable number.

425516781 is a deficient number, since it is larger than the sum of its proper divisors (152256275).

425516781 is a wasteful number, since it uses less digits than its factorization.

425516781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9012.

The product of its digits is 67200, while the sum is 39.

The square root of 425516781 is about 20628.0581005581. The cubic root of 425516781 is about 752.1519122376.

The spelling of 425516781 in words is "four hundred twenty-five million, five hundred sixteen thousand, seven hundred eighty-one".