681049701 has 20 divisors (see below), whose sum is σ = 1018666572. Its totient is φ = 453454848.

The previous prime is 681049687. The next prime is 681049709. The reversal of 681049701 is 107940186.

It can be written as a sum of positive squares in 2 ways, for example, as 127577025 + 553472676 = 11295^2 + 23526^2 .

It is not a de Polignac number, because 681049701 - 2²² = 676855397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681049709) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64165 + ... + 74021.

Almost surely, 2^681049701 is an apocalyptic number.

It is an amenable number.

681049701 is a deficient number, since it is larger than the sum of its proper divisors (337616871).

681049701 is an equidigital number, since it uses as much as digits as its factorization.

681049701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722 (or 10713 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 681049701 is about 26096.9289572547. The cubic root of 681049701 is about 879.8181877320.

Adding to 681049701 its reverse (107940186), we get a palindrome (788989887).

The spelling of 681049701 in words is "six hundred eighty-one million, forty-nine thousand, seven hundred one".