637428133 has 2 divisors, whose sum is σ = 637428134. Its totient is φ = 637428132.

The previous prime is 637428097. The next prime is 637428137. The reversal of 637428133 is 331824736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579027969 + 58400164 = 24063^2 + 7642^2 .

It is a cyclic number.

It is not a de Polignac number, because 637428133 - 2⁹ = 637427621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 637428092 and 637428101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637428137) 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, 318714066 + 318714067.

It is an arithmetic number, because the mean of its divisors is an integer number (318714067).

Almost surely, 2^637428133 is an apocalyptic number.

It is an amenable number.

637428133 is a deficient number, since it is larger than the sum of its proper divisors (1).

637428133 is an equidigital number, since it uses as much as digits as its factorization.

637428133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 37.

The square root of 637428133 is about 25247.3391271239. The cubic root of 637428133 is about 860.6179680467.

The spelling of 637428133 in words is "six hundred thirty-seven million, four hundred twenty-eight thousand, one hundred thirty-three".