681127049 has 12 divisors (see below), whose sum is σ = 729988284. Its totient is φ = 635357184.

The previous prime is 681127021. The next prime is 681127061. The reversal of 681127049 is 940721186.

It can be written as a sum of positive squares in 6 ways, for example, as 54125449 + 627001600 = 7357^2 + 25040^2 .

It is not a de Polignac number, because 681127049 - 2²⁸ = 412691593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681127549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22229 + ... + 43085.

It is an arithmetic number, because the mean of its divisors is an integer number (60832357).

Almost surely, 2^681127049 is an apocalyptic number.

It is an amenable number.

681127049 is a deficient number, since it is larger than the sum of its proper divisors (48861235).

681127049 is a wasteful number, since it uses less digits than its factorization.

681127049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21004 (or 20987 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 681127049 is about 26098.4108520040. The cubic root of 681127049 is about 879.8514939655.

The spelling of 681127049 in words is "six hundred eighty-one million, one hundred twenty-seven thousand, forty-nine".