637543 has 2 divisors, whose sum is σ = 637544. Its totient is φ = 637542.

The previous prime is 637531. The next prime is 637573. The reversal of 637543 is 345736.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 637543 - 2¹³ = 629351 is a prime.

It is a super-2 number, since 2×637543² = 812922153698, which contains 22 as substring.

637543 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318771 + 318772.

It is an arithmetic number, because the mean of its divisors is an integer number (318772).

2⁶³⁷⁵⁴³ is an apocalyptic number.

637543 is a deficient number, since it is larger than the sum of its proper divisors (1).

637543 is an equidigital number, since it uses as much as digits as its factorization.

637543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 28.

The square root of 637543 is about 798.4628983240. The cubic root of 637543 is about 86.0669660497.

The spelling of 637543 in words is "six hundred thirty-seven thousand, five hundred forty-three".