213697 has 4 divisors (see below), whose sum is σ = 233136. Its totient is φ = 194260.

The previous prime is 213659. The next prime is 213713. The reversal of 213697 is 796312.

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 de Polignac number, because none of the positive numbers 2^k-213697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9703 + ... + 9724.

It is an arithmetic number, because the mean of its divisors is an integer number (58284).

2²¹³⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

213697 is a deficient number, since it is larger than the sum of its proper divisors (19439).

213697 is a wasteful number, since it uses less digits than its factorization.

213697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19438.

The product of its digits is 2268, while the sum is 28.

The square root of 213697 is about 462.2737284337. The cubic root of 213697 is about 59.7859968778.

The spelling of 213697 in words is "two hundred thirteen thousand, six hundred ninety-seven".