201031213 has 2 divisors, whose sum is σ = 201031214. Its totient is φ = 201031212.

The previous prime is 201031199. The next prime is 201031297. The reversal of 201031213 is 312130102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120516484 + 80514729 = 10978^2 + 8973^2 .

It is a cyclic number.

It is not a de Polignac number, because 201031213 - 2⁹ = 201030701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201031193 and 201031202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201031013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100515606 + 100515607.

It is an arithmetic number, because the mean of its divisors is an integer number (100515607).

Almost surely, 2^201031213 is an apocalyptic number.

It is an amenable number.

201031213 is a deficient number, since it is larger than the sum of its proper divisors (1).

201031213 is an equidigital number, since it uses as much as digits as its factorization.

201031213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 201031213 is about 14178.5476336612. The cubic root of 201031213 is about 585.8069201634.

Adding to 201031213 its reverse (312130102), we get a palindrome (513161315).

It can be divided in two parts, 20103 and 1213, that added together give a square (21316 = 146²).

The spelling of 201031213 in words is "two hundred one million, thirty-one thousand, two hundred thirteen".