681323623 has 2 divisors, whose sum is σ = 681323624. Its totient is φ = 681323622.

The previous prime is 681323567. The next prime is 681323633. The reversal of 681323623 is 326323186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681323623 - 2²⁵ = 647769191 is a prime.

It is a super-2 number, since 2×681323623² = 928403758515692258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681323633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340661811 + 340661812.

It is an arithmetic number, because the mean of its divisors is an integer number (340661812).

Almost surely, 2^681323623 is an apocalyptic number.

681323623 is a deficient number, since it is larger than the sum of its proper divisors (1).

681323623 is an equidigital number, since it uses as much as digits as its factorization.

681323623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 34.

The square root of 681323623 is about 26102.1765950658. The cubic root of 681323623 is about 879.9361278538.

The spelling of 681323623 in words is "six hundred eighty-one million, three hundred twenty-three thousand, six hundred twenty-three".