423577561 has 9 divisors (see below), whose sum is σ = 465834229. Its totient is φ = 384864700.

The previous prime is 423577541. The next prime is 423577571. The reversal of 423577561 is 165775324.

The square root of 423577561 is 20581.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 423577561 - 2⁵ = 423577529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423577541) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 225456 + ... + 227326.

Almost surely, 2^423577561 is an apocalyptic number.

423577561 is the 20581-st square number.

423577561 is the 10291-st centered octagonal number.

It is an amenable number.

423577561 is a deficient number, since it is larger than the sum of its proper divisors (42256668).

423577561 is an frugal number, since it uses more digits than its factorization.

423577561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764 (or 1882 counting only the distinct ones).

The product of its digits is 176400, while the sum is 40.

The cubic root of 423577561 is about 751.0075708322.

Multiplying 423577561 by its product of digits (176400), we get a square (74719081760400 = 8644020²).

It can be divided in two parts, 4235 and 77561, that added together give a square (81796 = 286²).

The spelling of 423577561 in words is "four hundred twenty-three million, five hundred seventy-seven thousand, five hundred sixty-one".