681045031 has 4 divisors (see below), whose sum is σ = 682205832. Its totient is φ = 679884232.

The previous prime is 681044989. The next prime is 681045061. The reversal of 681045031 is 130540186.

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 681045031 - 2⁹ = 681044519 is a prime.

It is a super-3 number, since 3×681045031³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681045061) 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, 579520 + ... + 580693.

It is an arithmetic number, because the mean of its divisors is an integer number (170551458).

Almost surely, 2^681045031 is an apocalyptic number.

681045031 is a deficient number, since it is larger than the sum of its proper divisors (1160801).

681045031 is a wasteful number, since it uses less digits than its factorization.

681045031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160800.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 681045031 is about 26096.8394829719. The cubic root of 681045031 is about 879.8161767381.

The spelling of 681045031 in words is "six hundred eighty-one million, forty-five thousand, thirty-one".