426619681 has 4 divisors (see below), whose sum is σ = 426962500. Its totient is φ = 426276864.

The previous prime is 426619679. The next prime is 426619693. The reversal of 426619681 is 186916624.

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

It can be written as a sum of positive squares in 2 ways, for example, as 149230656 + 277389025 = 12216^2 + 16655^2 .

It is a cyclic number.

It is not a de Polignac number, because 426619681 - 2¹ = 426619679 is a prime.

It is a super-2 number, since 2×426619681² = 364008704433083522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (426619601) 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, 169536 + ... + 172033.

It is an arithmetic number, because the mean of its divisors is an integer number (106740625).

Almost surely, 2^426619681 is an apocalyptic number.

It is an amenable number.

426619681 is a deficient number, since it is larger than the sum of its proper divisors (342819).

426619681 is a wasteful number, since it uses less digits than its factorization.

426619681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342818.

The product of its digits is 124416, while the sum is 43.

The square root of 426619681 is about 20654.7738065562. The cubic root of 426619681 is about 752.8011875871.

The spelling of 426619681 in words is "four hundred twenty-six million, six hundred nineteen thousand, six hundred eighty-one".