428188331 has 2 divisors, whose sum is σ = 428188332. Its totient is φ = 428188330.

The previous prime is 428188273. The next prime is 428188349. The reversal of 428188331 is 133881824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428188331 - 2¹⁰ = 428187307 is a prime.

It is a super-2 number, since 2×428188331² = 366690493609131122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428188391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214094165 + 214094166.

It is an arithmetic number, because the mean of its divisors is an integer number (214094166).

Almost surely, 2^428188331 is an apocalyptic number.

428188331 is a deficient number, since it is larger than the sum of its proper divisors (1).

428188331 is an equidigital number, since it uses as much as digits as its factorization.

428188331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 38.

The square root of 428188331 is about 20692.7120262183. The cubic root of 428188331 is about 753.7227243764.

The spelling of 428188331 in words is "four hundred twenty-eight million, one hundred eighty-eight thousand, three hundred thirty-one".