427221581 has 2 divisors, whose sum is σ = 427221582. Its totient is φ = 427221580.

The previous prime is 427221539. The next prime is 427221589. The reversal of 427221581 is 185122724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269944900 + 157276681 = 16430^2 + 12541^2 .

It is a cyclic number.

It is not a de Polignac number, because 427221581 - 2²² = 423027277 is a prime.

It is a super-2 number, since 2×427221581² = 365036558544279122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427221589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213610790 + 213610791.

It is an arithmetic number, because the mean of its divisors is an integer number (213610791).

Almost surely, 2^427221581 is an apocalyptic number.

It is an amenable number.

427221581 is a deficient number, since it is larger than the sum of its proper divisors (1).

427221581 is an equidigital number, since it uses as much as digits as its factorization.

427221581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 32.

The square root of 427221581 is about 20669.3391524741. The cubic root of 427221581 is about 753.1550532041.

The spelling of 427221581 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, five hundred eighty-one".