681958193 has 4 divisors (see below), whose sum is σ = 779380800. Its totient is φ = 584535588.

The previous prime is 681958163. The next prime is 681958219. The reversal of 681958193 is 391859186.

It is a happy number.

681958193 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 681958193 - 2¹⁴ = 681941809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681958103) 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, 48711293 + ... + 48711306.

It is an arithmetic number, because the mean of its divisors is an integer number (194845200).

Almost surely, 2^681958193 is an apocalyptic number.

It is an amenable number.

681958193 is a deficient number, since it is larger than the sum of its proper divisors (97422607).

681958193 is an equidigital number, since it uses as much as digits as its factorization.

681958193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97422606.

The product of its digits is 466560, while the sum is 50.

The square root of 681958193 is about 26114.3292657499. The cubic root of 681958193 is about 880.2092275404.

The spelling of 681958193 in words is "six hundred eighty-one million, nine hundred fifty-eight thousand, one hundred ninety-three".