681751471 has 4 divisors (see below), whose sum is σ = 682148872. Its totient is φ = 681354072.

The previous prime is 681751457. The next prime is 681751501. The reversal of 681751471 is 174157186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681751471 - 2¹¹ = 681749423 is a prime.

It is a super-3 number, since 3×681751471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681751171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196116 + ... + 199561.

It is an arithmetic number, because the mean of its divisors is an integer number (170537218).

Almost surely, 2^681751471 is an apocalyptic number.

681751471 is a deficient number, since it is larger than the sum of its proper divisors (397401).

681751471 is a wasteful number, since it uses less digits than its factorization.

681751471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397400.

The product of its digits is 47040, while the sum is 40.

The square root of 681751471 is about 26110.3709471926. The cubic root of 681751471 is about 880.1202792722.

The spelling of 681751471 in words is "six hundred eighty-one million, seven hundred fifty-one thousand, four hundred seventy-one".