427207561 has 9 divisors (see below), whose sum is σ = 469825293. Its totient is φ = 388163820.

The previous prime is 427207549. The next prime is 427207591. The reversal of 427207561 is 165702724.

The square root of 427207561 is 20669.

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

It is not a de Polignac number, because 427207561 - 2¹³ = 427199369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427207531) 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, 226420 + ... + 228298.

Almost surely, 2^427207561 is an apocalyptic number.

427207561 is the 20669-th square number.

427207561 is the 10335-th centered octagonal number.

It is an amenable number.

427207561 is a deficient number, since it is larger than the sum of its proper divisors (42617732).

427207561 is an frugal number, since it uses more digits than its factorization.

427207561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The cubic root of 427207561 is about 753.1468144276.

The spelling of 427207561 in words is "four hundred twenty-seven million, two hundred seven thousand, five hundred sixty-one".