427811921 has 2 divisors, whose sum is σ = 427811922. Its totient is φ = 427811920.

The previous prime is 427811903. The next prime is 427811933. The reversal of 427811921 is 129118724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354794896 + 73017025 = 18836^2 + 8545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427811921 is a prime.

It is not a weakly prime, because it can be changed into another prime (427811941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213905960 + 213905961.

It is an arithmetic number, because the mean of its divisors is an integer number (213905961).

Almost surely, 2^427811921 is an apocalyptic number.

It is an amenable number.

427811921 is a deficient number, since it is larger than the sum of its proper divisors (1).

427811921 is an equidigital number, since it uses as much as digits as its factorization.

427811921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 427811921 is about 20683.6147952915. The cubic root of 427811921 is about 753.5017998248.

The spelling of 427811921 in words is "four hundred twenty-seven million, eight hundred eleven thousand, nine hundred twenty-one".