681958 has 4 divisors (see below), whose sum is σ = 1022940. Its totient is φ = 340978.

The previous prime is 681949. The next prime is 681971. The reversal of 681958 is 859186.

681958 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170488 + ... + 170491.

It is an arithmetic number, because the mean of its divisors is an integer number (255735).

2⁶⁸¹⁹⁵⁸ is an apocalyptic number.

681958 is a deficient number, since it is larger than the sum of its proper divisors (340982).

681958 is a wasteful number, since it uses less digits than its factorization.

681958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340981.

The product of its digits is 17280, while the sum is 37.

The square root of 681958 is about 825.8074836183. The cubic root of 681958 is about 88.0209144505.

The spelling of 681958 in words is "six hundred eighty-one thousand, nine hundred fifty-eight".