201864401 has 4 divisors (see below), whose sum is σ = 202553652. Its totient is φ = 201175152.

The previous prime is 201864391. The next prime is 201864427. The reversal of 201864401 is 104468102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104468102 = 2 ⋅52234051.

It can be written as a sum of positive squares in 2 ways, for example, as 140398801 + 61465600 = 11849^2 + 7840^2 .

It is a cyclic number.

It is not a de Polignac number, because 201864401 - 2⁶ = 201864337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201864451) 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, 344186 + ... + 344771.

It is an arithmetic number, because the mean of its divisors is an integer number (50638413).

Almost surely, 2^201864401 is an apocalyptic number.

It is an amenable number.

201864401 is a deficient number, since it is larger than the sum of its proper divisors (689251).

201864401 is an equidigital number, since it uses as much as digits as its factorization.

201864401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689250.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 201864401 is about 14207.8992465459. The cubic root of 201864401 is about 586.6151106482.

The spelling of 201864401 in words is "two hundred one million, eight hundred sixty-four thousand, four hundred one".