428191885237 has 2 divisors, whose sum is σ = 428191885238. Its totient is φ = 428191885236.

The previous prime is 428191885183. The next prime is 428191885243. The reversal of 428191885237 is 732588191824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426793050436 + 1398834801 = 653294^2 + 37401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428191885237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428191085237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214095942618 + 214095942619.

It is an arithmetic number, because the mean of its divisors is an integer number (214095942619).

Almost surely, 2^428191885237 is an apocalyptic number.

It is an amenable number.

428191885237 is a deficient number, since it is larger than the sum of its proper divisors (1).

428191885237 is an equidigital number, since it uses as much as digits as its factorization.

428191885237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 58.

The spelling of 428191885237 in words is "four hundred twenty-eight billion, one hundred ninety-one million, eight hundred eighty-five thousand, two hundred thirty-seven".