637139 has 2 divisors, whose sum is σ = 637140. Its totient is φ = 637138.

The previous prime is 637129. The next prime is 637157. The reversal of 637139 is 931736.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 637139 - 2¹⁶ = 571603 is a prime.

It is a super-2 number, since 2×637139² = 811892210642, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (637129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318569 + 318570.

It is an arithmetic number, because the mean of its divisors is an integer number (318570).

2⁶³⁷¹³⁹ is an apocalyptic number.

637139 is a deficient number, since it is larger than the sum of its proper divisors (1).

637139 is an equidigital number, since it uses as much as digits as its factorization.

637139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 29.

The square root of 637139 is about 798.2098721514. The cubic root of 637139 is about 86.0487824911.

The spelling of 637139 in words is "six hundred thirty-seven thousand, one hundred thirty-nine".