201869591401 has 3 divisors (see below), whose sum is σ = 201870040701. Its totient is φ = 201869142102.

The previous prime is 201869591369. The next prime is 201869591449. The reversal of 201869591401 is 104195968102.

It is a happy number.

The square root of 201869591401 is 449299.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 201869591401 - 2⁵ = 201869591369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201869591471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 224650 + ... + 673948.

It is an arithmetic number, because the mean of its divisors is an integer number (67290013567).

Almost surely, 2^201869591401 is an apocalyptic number.

201869591401 is the 449299-th square number.

201869591401 is the 224650-th centered octagonal number.

It is an amenable number.

201869591401 is a deficient number, since it is larger than the sum of its proper divisors (449300).

201869591401 is an frugal number, since it uses more digits than its factorization.

201869591401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898598 (or 449299 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 201869591401 in words is "two hundred one billion, eight hundred sixty-nine million, five hundred ninety-one thousand, four hundred one".