30531073 has 2 divisors, whose sum is σ = 30531074. Its totient is φ = 30531072.

The previous prime is 30531071. The next prime is 30531079. The reversal of 30531073 is 37013503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29942784 + 588289 = 5472^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 30531073 - 2¹ = 30531071 is a prime.

Together with 30531071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30531071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15265536 + 15265537.

It is an arithmetic number, because the mean of its divisors is an integer number (15265537).

Almost surely, 2^30531073 is an apocalyptic number.

It is an amenable number.

30531073 is a deficient number, since it is larger than the sum of its proper divisors (1).

30531073 is an equidigital number, since it uses as much as digits as its factorization.

30531073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945, while the sum is 22.

The square root of 30531073 is about 5525.4930096780. The cubic root of 30531073 is about 312.5460557187.

Adding to 30531073 its reverse (37013503), we get a palindrome (67544576).

The spelling of 30531073 in words is "thirty million, five hundred thirty-one thousand, seventy-three".