31030213 has 2 divisors, whose sum is σ = 31030214. Its totient is φ = 31030212.

The previous prime is 31030201. The next prime is 31030267. The reversal of 31030213 is 31203013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22724289 + 8305924 = 4767^2 + 2882^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030213 - 2²¹ = 28933061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31030193 and 31030202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31030513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515106 + 15515107.

It is an arithmetic number, because the mean of its divisors is an integer number (15515107).

Almost surely, 2^31030213 is an apocalyptic number.

It is an amenable number.

31030213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31030213 is an equidigital number, since it uses as much as digits as its factorization.

31030213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 31030213 is about 5570.4769095653. The cubic root of 31030213 is about 314.2400864398.

Adding to 31030213 its reverse (31203013), we get a palindrome (62233226).

The spelling of 31030213 in words is "thirty-one million, thirty thousand, two hundred thirteen".