681174451 has 4 divisors (see below), whose sum is σ = 697788504. Its totient is φ = 664560400.

The previous prime is 681174437. The next prime is 681174457. The reversal of 681174451 is 154471186.

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 681174451 - 2¹¹ = 681172403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681174451.

It is not an unprimeable number, because it can be changed into a prime (681174457) 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, 8306965 + ... + 8307046.

It is an arithmetic number, because the mean of its divisors is an integer number (174447126).

Almost surely, 2^681174451 is an apocalyptic number.

681174451 is a deficient number, since it is larger than the sum of its proper divisors (16614053).

681174451 is a wasteful number, since it uses less digits than its factorization.

681174451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16614052.

The product of its digits is 26880, while the sum is 37.

The square root of 681174451 is about 26099.3189757894. The cubic root of 681174451 is about 879.8719041337.

The spelling of 681174451 in words is "six hundred eighty-one million, one hundred seventy-four thousand, four hundred fifty-one".