681123431 has 2 divisors, whose sum is σ = 681123432. Its totient is φ = 681123430.

The previous prime is 681123409. The next prime is 681123463. The reversal of 681123431 is 134321186.

681123431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681123431 - 2⁶ = 681123367 is a prime.

It is a super-2 number, since 2×681123431² = 927858256514423522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 681123394 and 681123403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681123931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340561715 + 340561716.

It is an arithmetic number, because the mean of its divisors is an integer number (340561716).

Almost surely, 2^681123431 is an apocalyptic number.

681123431 is a deficient number, since it is larger than the sum of its proper divisors (1).

681123431 is an equidigital number, since it uses as much as digits as its factorization.

681123431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 681123431 is about 26098.3415373468. The cubic root of 681123431 is about 879.8499361023.

The spelling of 681123431 in words is "six hundred eighty-one million, one hundred twenty-three thousand, four hundred thirty-one".