201869 has 4 divisors (see below), whose sum is σ = 208860. Its totient is φ = 194880.

The previous prime is 201847. The next prime is 201881. The reversal of 201869 is 968102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 133225 + 68644 = 365^2 + 262^2 .

It is not a de Polignac number, because 201869 - 2¹² = 197773 is a prime.

It is a super-2 number, since 2×201869² = 81502186322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201809) 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, 3452 + ... + 3509.

It is an arithmetic number, because the mean of its divisors is an integer number (52215).

2²⁰¹⁸⁶⁹ is an apocalyptic number.

201869 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

201869 is a deficient number, since it is larger than the sum of its proper divisors (6991).

201869 is an equidigital number, since it uses as much as digits as its factorization.

201869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6990.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 201869 is about 449.2983418621. The cubic root of 201869 is about 58.6619565491.

The spelling of 201869 in words is "two hundred one thousand, eight hundred sixty-nine".