31330073 has 2 divisors, whose sum is σ = 31330074. Its totient is φ = 31330072.

The previous prime is 31330043. The next prime is 31330087. The reversal of 31330073 is 37003313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31225744 + 104329 = 5588^2 + 323^2 .

It is an emirp because it is prime and its reverse (37003313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31330073 - 2¹⁸ = 31067929 is a prime.

It is not a weakly prime, because it can be changed into another prime (31330043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665036 + 15665037.

It is an arithmetic number, because the mean of its divisors is an integer number (15665037).

Almost surely, 2^31330073 is an apocalyptic number.

It is an amenable number.

31330073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31330073 is an equidigital number, since it uses as much as digits as its factorization.

31330073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 20.

The square root of 31330073 is about 5597.3273086358. The cubic root of 31330073 is about 315.2490614418.

Adding to 31330073 its reverse (37003313), we get a palindrome (68333386).

The spelling of 31330073 in words is "thirty-one million, three hundred thirty thousand, seventy-three".