640126237 has 2 divisors, whose sum is σ = 640126238. Its totient is φ = 640126236.

The previous prime is 640126231. The next prime is 640126243. The reversal of 640126237 is 732621046.

640126237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (640126231) and next prime (640126243).

It can be written as a sum of positive squares in only one way, i.e., 338964921 + 301161316 = 18411^2 + 17354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640126237 is a prime.

It is equal to p_33306754 and since 640126237 and 33306754 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 640126199 and 640126208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640126231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320063118 + 320063119.

It is an arithmetic number, because the mean of its divisors is an integer number (320063119).

Almost surely, 2^640126237 is an apocalyptic number.

It is an amenable number.

640126237 is a deficient number, since it is larger than the sum of its proper divisors (1).

640126237 is an equidigital number, since it uses as much as digits as its factorization.

640126237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 640126237 is about 25300.7161361097. The cubic root of 640126237 is about 861.8305325737.

The spelling of 640126237 in words is "six hundred forty million, one hundred twenty-six thousand, two hundred thirty-seven".