30561397 has 2 divisors, whose sum is σ = 30561398. Its totient is φ = 30561396.

The previous prime is 30561379. The next prime is 30561403. The reversal of 30561397 is 79316503.

Together with previous prime (30561379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26071236 + 4490161 = 5106^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 30561397 - 2⁷ = 30561269 is a prime.

It is equal to p_1890493 and since 30561397 and 1890493 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30061397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15280698 + 15280699.

It is an arithmetic number, because the mean of its divisors is an integer number (15280699).

Almost surely, 2^30561397 is an apocalyptic number.

It is an amenable number.

30561397 is a deficient number, since it is larger than the sum of its proper divisors (1).

30561397 is an equidigital number, since it uses as much as digits as its factorization.

30561397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 30561397 is about 5528.2363372056. The cubic root of 30561397 is about 312.6494968974.

The spelling of 30561397 in words is "thirty million, five hundred sixty-one thousand, three hundred ninety-seven".