681235 has 4 divisors (see below), whose sum is σ = 817488. Its totient is φ = 544984.

The previous prime is 681229. The next prime is 681251. The reversal of 681235 is 532186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 532186 = 2 ⋅266093.

It is a cyclic number.

It is not a de Polignac number, because 681235 - 2¹⁷ = 550163 is a prime.

It is a super-2 number, since 2×681235² = 928162250450, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁷ + 8⁴ + 2⁴ + 1 + 3⁸ + 5⁸ .

It is a Duffinian number.

681235 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68119 + ... + 68128.

It is an arithmetic number, because the mean of its divisors is an integer number (204372).

2⁶⁸¹²³⁵ is an apocalyptic number.

681235 is a deficient number, since it is larger than the sum of its proper divisors (136253).

681235 is a wasteful number, since it uses less digits than its factorization.

681235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136252.

The product of its digits is 1440, while the sum is 25.

The square root of 681235 is about 825.3696141729. The cubic root of 681235 is about 87.9897973709.

The spelling of 681235 in words is "six hundred eighty-one thousand, two hundred thirty-five".