30755381 has 2 divisors, whose sum is σ = 30755382. Its totient is φ = 30755380.

The previous prime is 30755369. The next prime is 30755383. The reversal of 30755381 is 18355703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23280625 + 7474756 = 4825^2 + 2734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30755381 is a prime.

It is a super-2 number, since 2×30755381² = 1891786920910322, which contains 22 as substring.

Together with 30755383, 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 (30755383) 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, 15377690 + 15377691.

It is an arithmetic number, because the mean of its divisors is an integer number (15377691).

Almost surely, 2^30755381 is an apocalyptic number.

It is an amenable number.

30755381 is a deficient number, since it is larger than the sum of its proper divisors (1).

30755381 is an equidigital number, since it uses as much as digits as its factorization.

30755381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 30755381 is about 5545.7534204110. The cubic root of 30755381 is about 313.3096012155.

The spelling of 30755381 in words is "thirty million, seven hundred fifty-five thousand, three hundred eighty-one".