681127907 has 4 divisors (see below), whose sum is σ = 683841816. Its totient is φ = 678414000.

The previous prime is 681127883. The next prime is 681127949. The reversal of 681127907 is 709721186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 709721186 = 2 ⋅354860593.

It is a cyclic number.

It is not a de Polignac number, because 681127907 - 2¹⁴ = 681111523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681127507) 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, 1356578 + ... + 1357079.

It is an arithmetic number, because the mean of its divisors is an integer number (170960454).

Almost surely, 2^681127907 is an apocalyptic number.

681127907 is a deficient number, since it is larger than the sum of its proper divisors (2713909).

681127907 is a wasteful number, since it uses less digits than its factorization.

681127907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713908.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 681127907 is about 26098.4272897813. The cubic root of 681127907 is about 879.8518634082.

The spelling of 681127907 in words is "six hundred eighty-one million, one hundred twenty-seven thousand, nine hundred seven".