201639314281 has 4 divisors (see below), whose sum is σ = 201714303700. Its totient is φ = 201564324864.

The previous prime is 201639314207. The next prime is 201639314299. The reversal of 201639314281 is 182413936102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182413936102 = 2 ⋅91206968051.

It can be written as a sum of positive squares in 2 ways, for example, as 10421143056 + 191218171225 = 102084^2 + 437285^2 .

It is a cyclic number.

It is not a de Polignac number, because 201639314281 - 2⁹ = 201639313769 is a prime.

It is a super-2 number, since 2×201639314281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201639314581) 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, 37490676 + ... + 37496053.

It is an arithmetic number, because the mean of its divisors is an integer number (50428575925).

Almost surely, 2^201639314281 is an apocalyptic number.

It is an amenable number.

201639314281 is a deficient number, since it is larger than the sum of its proper divisors (74989419).

201639314281 is an equidigital number, since it uses as much as digits as its factorization.

201639314281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74989418.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 201639314281 in words is "two hundred one billion, six hundred thirty-nine million, three hundred fourteen thousand, two hundred eighty-one".