30531223 has 2 divisors, whose sum is σ = 30531224. Its totient is φ = 30531222.

The previous prime is 30531203. The next prime is 30531239. The reversal of 30531223 is 32213503.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30531223 - 2⁵ = 30531191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30531223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30531203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15265611 + 15265612.

It is an arithmetic number, because the mean of its divisors is an integer number (15265612).

Almost surely, 2^30531223 is an apocalyptic number.

30531223 is a deficient number, since it is larger than the sum of its proper divisors (1).

30531223 is an equidigital number, since it uses as much as digits as its factorization.

30531223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 30531223 is about 5525.5065831107. The cubic root of 30531223 is about 312.5465675670.

Adding to 30531223 its reverse (32213503), we get a palindrome (62744726).

The spelling of 30531223 in words is "thirty million, five hundred thirty-one thousand, two hundred twenty-three".