31030201 has 2 divisors, whose sum is σ = 31030202. Its totient is φ = 31030200.

The previous prime is 31030193. The next prime is 31030213. The reversal of 31030201 is 10203013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18498601 + 12531600 = 4301^2 + 3540^2 .

It is an emirp because it is prime and its reverse (10203013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31030201 - 2³ = 31030193 is a prime.

It is not a weakly prime, because it can be changed into another prime (31030001) 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 as a sum of consecutive naturals, namely, 15515100 + 15515101.

It is an arithmetic number, because the mean of its divisors is an integer number (15515101).

Almost surely, 2^31030201 is an apocalyptic number.

It is an amenable number.

31030201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31030201 is an equidigital number, since it uses as much as digits as its factorization.

31030201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 31030201 is about 5570.4758324581. The cubic root of 31030201 is about 314.2400459322.

Adding to 31030201 its reverse (10203013), we get a palindrome (41233214).

The spelling of 31030201 in words is "thirty-one million, thirty thousand, two hundred one".