637271713849 has 3 divisors (see below), whose sum is σ = 637272512143. Its totient is φ = 637270915556.

The previous prime is 637271713847. The next prime is 637271713873. The reversal of 637271713849 is 948317172736.

It is a happy number.

The square root of 637271713849 is 798293.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 123085197225 + 514186516624 = 350835^2 + 717068^2 .

It is not a de Polignac number, because 637271713849 - 2¹ = 637271713847 is a prime.

It is a super-2 number, since 2×637271713849² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 637271713793 and 637271713802.

It is not an unprimeable number, because it can be changed into a prime (637271713847) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 399147 + ... + 1197439.

Almost surely, 2^637271713849 is an apocalyptic number.

637271713849 is the 798293-rd square number.

637271713849 is the 399147-th centered octagonal number.

It is an amenable number.

637271713849 is a deficient number, since it is larger than the sum of its proper divisors (798294).

637271713849 is an frugal number, since it uses more digits than its factorization.

637271713849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596586 (or 798293 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 58.

The spelling of 637271713849 in words is "six hundred thirty-seven billion, two hundred seventy-one million, seven hundred thirteen thousand, eight hundred forty-nine".