681104551 has 4 divisors (see below), whose sum is σ = 681639192. Its totient is φ = 680569912.

The previous prime is 681104539. The next prime is 681104569. The reversal of 681104551 is 155401186.

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 681104551 - 2⁵ = 681104519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681104531) 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, 265405 + ... + 267958.

It is an arithmetic number, because the mean of its divisors is an integer number (170409798).

Almost surely, 2^681104551 is an apocalyptic number.

681104551 is a deficient number, since it is larger than the sum of its proper divisors (534641).

681104551 is a wasteful number, since it uses less digits than its factorization.

681104551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534640.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 681104551 is about 26097.9798260325. The cubic root of 681104551 is about 879.8418065330.

The spelling of 681104551 in words is "six hundred eighty-one million, one hundred four thousand, five hundred fifty-one".