30491225 has 6 divisors (see below), whose sum is σ = 37809150. Its totient is φ = 24392960.

The previous prime is 30491221. The next prime is 30491239. The reversal of 30491225 is 52219403.

It can be written as a sum of positive squares in 3 ways, for example, as 3575881 + 26915344 = 1891^2 + 5188^2 .

It is not a de Polignac number, because 30491225 - 2² = 30491221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30491194 and 30491203.

It is not an unprimeable number, because it can be changed into a prime (30491221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 609800 + ... + 609849.

It is an arithmetic number, because the mean of its divisors is an integer number (6301525).

Almost surely, 2^30491225 is an apocalyptic number.

It is an amenable number.

30491225 is a deficient number, since it is larger than the sum of its proper divisors (7317925).

30491225 is a wasteful number, since it uses less digits than its factorization.

30491225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219659 (or 1219654 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 30491225 is about 5521.8860002720. The cubic root of 30491225 is about 312.4100220952.

The spelling of 30491225 in words is "thirty million, four hundred ninety-one thousand, two hundred twenty-five".