681487093 has 4 divisors (see below), whose sum is σ = 778842400. Its totient is φ = 584131788.

The previous prime is 681487073. The next prime is 681487099. The reversal of 681487093 is 390784186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681487093 - 2⁹ = 681486581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681487099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48677643 + ... + 48677656.

It is an arithmetic number, because the mean of its divisors is an integer number (194710600).

Almost surely, 2^681487093 is an apocalyptic number.

It is an amenable number.

681487093 is a deficient number, since it is larger than the sum of its proper divisors (97355307).

681487093 is an equidigital number, since it uses as much as digits as its factorization.

681487093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97355306.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 681487093 is about 26105.3077553206. The cubic root of 681487093 is about 880.0064965946.

The spelling of 681487093 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, ninety-three".