637316389 has 4 divisors (see below), whose sum is σ = 640099660. Its totient is φ = 634533120.

The previous prime is 637316371. The next prime is 637316399. The reversal of 637316389 is 983613736.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 613404289 + 23912100 = 24767^2 + 4890^2 .

It is a cyclic number.

It is not a de Polignac number, because 637316389 - 2¹³ = 637308197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637316369) 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 in 3 ways as a sum of consecutive naturals, for example, 1391292 + ... + 1391749.

It is an arithmetic number, because the mean of its divisors is an integer number (160024915).

Almost surely, 2^637316389 is an apocalyptic number.

It is an amenable number.

637316389 is a deficient number, since it is larger than the sum of its proper divisors (2783271).

637316389 is a wasteful number, since it uses less digits than its factorization.

637316389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783270.

The product of its digits is 489888, while the sum is 46.

The square root of 637316389 is about 25245.1260444467. The cubic root of 637316389 is about 860.5676750492.

The spelling of 637316389 in words is "six hundred thirty-seven million, three hundred sixteen thousand, three hundred eighty-nine".