681134791 has 2 divisors, whose sum is σ = 681134792. Its totient is φ = 681134790.

The previous prime is 681134771. The next prime is 681134807. The reversal of 681134791 is 197431186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681134791 - 2²⁹ = 144263879 is a prime.

It is a super-3 number, since 3×681134791³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681134771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340567395 + 340567396.

It is an arithmetic number, because the mean of its divisors is an integer number (340567396).

Almost surely, 2^681134791 is an apocalyptic number.

681134791 is a deficient number, since it is larger than the sum of its proper divisors (1).

681134791 is an equidigital number, since it uses as much as digits as its factorization.

681134791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 681134791 is about 26098.5591747897. The cubic root of 681134791 is about 879.8548275503.

The spelling of 681134791 in words is "six hundred eighty-one million, one hundred thirty-four thousand, seven hundred ninety-one".