681898471 has 2 divisors, whose sum is σ = 681898472. Its totient is φ = 681898470.

The previous prime is 681898453. The next prime is 681898501. The reversal of 681898471 is 174898186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681898471 is a prime.

It is a super-3 number, since 3×681898471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681896471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340949235 + 340949236.

It is an arithmetic number, because the mean of its divisors is an integer number (340949236).

Almost surely, 2^681898471 is an apocalyptic number.

681898471 is a deficient number, since it is larger than the sum of its proper divisors (1).

681898471 is an equidigital number, since it uses as much as digits as its factorization.

681898471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 52.

The square root of 681898471 is about 26113.1857688793. The cubic root of 681898471 is about 880.1835322262.

The spelling of 681898471 in words is "six hundred eighty-one million, eight hundred ninety-eight thousand, four hundred seventy-one".