30531225 has 12 divisors (see below), whose sum is σ = 50478416. Its totient is φ = 16283280.

The previous prime is 30531223. The next prime is 30531239. The reversal of 30531225 is 52213503.

It is not a de Polignac number, because 30531225 - 2¹ = 30531223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30531223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203467 + ... + 203616.

Almost surely, 2^30531225 is an apocalyptic number.

It is an amenable number.

30531225 is a deficient number, since it is larger than the sum of its proper divisors (19947191).

30531225 is a wasteful number, since it uses less digits than its factorization.

30531225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407096 (or 407091 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 30531225 is about 5525.5067640896. The cubic root of 30531225 is about 312.5465743916.

Adding to 30531225 its reverse (52213503), we get a palindrome (82744728).

It can be divided in two parts, 3053 and 1225, that added together give a triangular number (4278 = T₉₂).

The spelling of 30531225 in words is "thirty million, five hundred thirty-one thousand, two hundred twenty-five".