30900913 has 2 divisors, whose sum is σ = 30900914. Its totient is φ = 30900912.

The previous prime is 30900911. The next prime is 30900931. The reversal of 30900913 is 31900903.

Together with next prime (30900931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26091664 + 4809249 = 5108^2 + 2193^2 .

It is an emirp because it is prime and its reverse (31900903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30900913 - 2¹ = 30900911 is a prime.

Together with 30900911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30900911) 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, 15450456 + 15450457.

It is an arithmetic number, because the mean of its divisors is an integer number (15450457).

Almost surely, 2^30900913 is an apocalyptic number.

It is an amenable number.

30900913 is a deficient number, since it is larger than the sum of its proper divisors (1).

30900913 is an equidigital number, since it uses as much as digits as its factorization.

30900913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 30900913 is about 5558.8589656511. The cubic root of 30900913 is about 313.8030090908.

It can be divided in two parts, 30900 and 913, that added together give a palindrome (31813).

The spelling of 30900913 in words is "thirty million, nine hundred thousand, nine hundred thirteen".