681097 has 4 divisors (see below), whose sum is σ = 684820. Its totient is φ = 677376.

The previous prime is 681091. The next prime is 681113. The reversal of 681097 is 790186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 790186 = 2 ⋅395093.

It can be written as a sum of positive squares in 2 ways, for example, as 109561 + 571536 = 331^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 681097 - 2³ = 681089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681091) 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, 1572 + ... + 1957.

It is an arithmetic number, because the mean of its divisors is an integer number (171205).

2⁶⁸¹⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

681097 is a deficient number, since it is larger than the sum of its proper divisors (3723).

681097 is a wasteful number, since it uses less digits than its factorization.

681097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 681097 is about 825.2860110289. The cubic root of 681097 is about 87.9838555094.

The spelling of 681097 in words is "six hundred eighty-one thousand, ninety-seven".