202691 has 4 divisors (see below), whose sum is σ = 214632. Its totient is φ = 190752.

The previous prime is 202679. The next prime is 202693. The reversal of 202691 is 196202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196202 = 2 ⋅98101.

It is a cyclic number.

It is not a de Polignac number, because 202691 - 2⁶ = 202627 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 202691.

It is not an unprimeable number, because it can be changed into a prime (202693) 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, 5945 + ... + 5978.

It is an arithmetic number, because the mean of its divisors is an integer number (53658).

2²⁰²⁶⁹¹ is an apocalyptic number.

202691 is a deficient number, since it is larger than the sum of its proper divisors (11941).

202691 is a wasteful number, since it uses less digits than its factorization.

202691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11940.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 202691 is about 450.2121722033. The cubic root of 202691 is about 58.7414715250.

Adding to 202691 its reverse (196202), we get a palindrome (398893).

The spelling of 202691 in words is "two hundred two thousand, six hundred ninety-one".