427566521 has 2 divisors, whose sum is σ = 427566522. Its totient is φ = 427566520.

The previous prime is 427566511. The next prime is 427566523. The reversal of 427566521 is 125665724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418775296 + 8791225 = 20464^2 + 2965^2 .

It is a cyclic number.

It is not a de Polignac number, because 427566521 - 2⁶ = 427566457 is a prime.

It is a Sophie Germain prime.

Together with 427566523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (427566523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213783260 + 213783261.

It is an arithmetic number, because the mean of its divisors is an integer number (213783261).

Almost surely, 2^427566521 is an apocalyptic number.

It is an amenable number.

427566521 is a deficient number, since it is larger than the sum of its proper divisors (1).

427566521 is an equidigital number, since it uses as much as digits as its factorization.

427566521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 38.

The square root of 427566521 is about 20677.6817124164. The cubic root of 427566521 is about 753.3576985663.

The spelling of 427566521 in words is "four hundred twenty-seven million, five hundred sixty-six thousand, five hundred twenty-one".