681236293 has 2 divisors, whose sum is σ = 681236294. Its totient is φ = 681236292.

The previous prime is 681236263. The next prime is 681236321. The reversal of 681236293 is 392632186.

681236293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612711009 + 68525284 = 24753^2 + 8278^2 .

It is a cyclic number.

It is not a de Polignac number, because 681236293 - 2⁵ = 681236261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681236263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340618146 + 340618147.

It is an arithmetic number, because the mean of its divisors is an integer number (340618147).

Almost surely, 2^681236293 is an apocalyptic number.

It is an amenable number.

681236293 is a deficient number, since it is larger than the sum of its proper divisors (1).

681236293 is an equidigital number, since it uses as much as digits as its factorization.

681236293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 681236293 is about 26100.5036924577. The cubic root of 681236293 is about 879.8985303975.

The spelling of 681236293 in words is "six hundred eighty-one million, two hundred thirty-six thousand, two hundred ninety-three".