30705557 has 2 divisors, whose sum is σ = 30705558. Its totient is φ = 30705556.

The previous prime is 30705551. The next prime is 30705559. The reversal of 30705557 is 75550703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 14432401 = 4034^2 + 3799^2 .

It is a cyclic number.

It is not a de Polignac number, because 30705557 - 2²² = 26511253 is a prime.

It is a super-3 number, since 3×30705557³ (a number of 23 digits) contains 333 as substring.

Together with 30705559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30705551) 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, 15352778 + 15352779.

It is an arithmetic number, because the mean of its divisors is an integer number (15352779).

Almost surely, 2^30705557 is an apocalyptic number.

It is an amenable number.

30705557 is a deficient number, since it is larger than the sum of its proper divisors (1).

30705557 is an equidigital number, since it uses as much as digits as its factorization.

30705557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18375, while the sum is 32.

The square root of 30705557 is about 5541.2595138651. The cubic root of 30705557 is about 313.1403216262.

The spelling of 30705557 in words is "thirty million, seven hundred five thousand, five hundred fifty-seven".