637394497 has 4 divisors (see below), whose sum is σ = 640415536. Its totient is φ = 634373460.

The previous prime is 637394491. The next prime is 637394507. The reversal of 637394497 is 794493736.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 637394497 - 2²³ = 629005889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (637394491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510203 + ... + 1510624.

It is an arithmetic number, because the mean of its divisors is an integer number (160103884).

Almost surely, 2^637394497 is an apocalyptic number.

It is an amenable number.

637394497 is a deficient number, since it is larger than the sum of its proper divisors (3021039).

637394497 is a wasteful number, since it uses less digits than its factorization.

637394497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021038.

The product of its digits is 3429216, while the sum is 52.

The square root of 637394497 is about 25246.6729887326. The cubic root of 637394497 is about 860.6028299976.

The spelling of 637394497 in words is "six hundred thirty-seven million, three hundred ninety-four thousand, four hundred ninety-seven".