6731208749 has 4 divisors (see below), whose sum is σ = 6752443164. Its totient is φ = 6709974336.

The previous prime is 6731208739. The next prime is 6731208787. The reversal of 6731208749 is 9478021376.

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 3590166724 + 3141042025 = 59918^2 + 56045^2 .

It is a cyclic number.

It is not a de Polignac number, because 6731208749 - 2²⁴ = 6714431533 is a prime.

It is a super-2 number, since 2×6731208749² = 90618342445228290002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6731208709) 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, 10616732 + ... + 10617365.

It is an arithmetic number, because the mean of its divisors is an integer number (1688110791).

Almost surely, 2^6731208749 is an apocalyptic number.

It is an amenable number.

6731208749 is a deficient number, since it is larger than the sum of its proper divisors (21234415).

6731208749 is a wasteful number, since it uses less digits than its factorization.

6731208749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21234414.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 6731208749 is about 82043.9440117307. The cubic root of 6731208749 is about 1888.1262047155.

The spelling of 6731208749 in words is "six billion, seven hundred thirty-one million, two hundred eight thousand, seven hundred forty-nine".