681144127 has 2 divisors, whose sum is σ = 681144128. Its totient is φ = 681144126.

The previous prime is 681144097. The next prime is 681144133. The reversal of 681144127 is 721441186.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681144127 - 2¹⁵ = 681111359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681144092 and 681144101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681144157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340572063 + 340572064.

It is an arithmetic number, because the mean of its divisors is an integer number (340572064).

Almost surely, 2^681144127 is an apocalyptic number.

681144127 is a deficient number, since it is larger than the sum of its proper divisors (1).

681144127 is an equidigital number, since it uses as much as digits as its factorization.

681144127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 681144127 is about 26098.7380346254. The cubic root of 681144127 is about 879.8588474532.

The spelling of 681144127 in words is "six hundred eighty-one million, one hundred forty-four thousand, one hundred twenty-seven".