637874449 has 2 divisors, whose sum is σ = 637874450. Its totient is φ = 637874448.

The previous prime is 637874423. The next prime is 637874453. The reversal of 637874449 is 944478736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371140225 + 266734224 = 19265^2 + 16332^2 .

It is a cyclic number.

It is not a de Polignac number, because 637874449 - 2²³ = 629485841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 637874396 and 637874405.

It is not a weakly prime, because it can be changed into another prime (637874849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318937224 + 318937225.

It is an arithmetic number, because the mean of its divisors is an integer number (318937225).

Almost surely, 2^637874449 is an apocalyptic number.

It is an amenable number.

637874449 is a deficient number, since it is larger than the sum of its proper divisors (1).

637874449 is an equidigital number, since it uses as much as digits as its factorization.

637874449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 52.

The square root of 637874449 is about 25256.1764525037. The cubic root of 637874449 is about 860.8187843874.

The spelling of 637874449 in words is "six hundred thirty-seven million, eight hundred seventy-four thousand, four hundred forty-nine".