30725231 has 2 divisors, whose sum is σ = 30725232. Its totient is φ = 30725230.

The previous prime is 30725221. The next prime is 30725243. The reversal of 30725231 is 13252703.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30725231 - 2¹⁸ = 30463087 is a prime.

It is a super-2 number, since 2×30725231² = 1888079640006722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30725197 and 30725206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30725221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15362615 + 15362616.

It is an arithmetic number, because the mean of its divisors is an integer number (15362616).

Almost surely, 2^30725231 is an apocalyptic number.

30725231 is a deficient number, since it is larger than the sum of its proper divisors (1).

30725231 is an equidigital number, since it uses as much as digits as its factorization.

30725231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 30725231 is about 5543.0344577677. The cubic root of 30725231 is about 313.2071869102.

Adding to 30725231 its reverse (13252703), we get a palindrome (43977934).

The spelling of 30725231 in words is "thirty million, seven hundred twenty-five thousand, two hundred thirty-one".