201631313 has 4 divisors (see below), whose sum is σ = 217141428. Its totient is φ = 186121200.

The previous prime is 201631303. The next prime is 201631321. The reversal of 201631313 is 313136102.

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: 313136102 = 2 ⋅156568051.

It can be written as a sum of positive squares in 2 ways, for example, as 12623809 + 189007504 = 3553^2 + 13748^2 .

It is a cyclic number.

It is not a de Polignac number, because 201631313 - 2⁸ = 201631057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201631303) 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, 7755038 + ... + 7755063.

It is an arithmetic number, because the mean of its divisors is an integer number (54285357).

Almost surely, 2^201631313 is an apocalyptic number.

It is an amenable number.

201631313 is a deficient number, since it is larger than the sum of its proper divisors (15510115).

201631313 is a wasteful number, since it uses less digits than its factorization.

201631313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15510114.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 201631313 is about 14199.6941164238. The cubic root of 201631313 is about 586.3892402067.

Adding to 201631313 its reverse (313136102), we get a palindrome (514767415).

The spelling of 201631313 in words is "two hundred one million, six hundred thirty-one thousand, three hundred thirteen".