30855161 has 2 divisors, whose sum is σ = 30855162. Its totient is φ = 30855160.

The previous prime is 30855113. The next prime is 30855173. The reversal of 30855161 is 16155803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26677225 + 4177936 = 5165^2 + 2044^2 .

It is an emirp because it is prime and its reverse (16155803) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30855161 is a prime.

It is not a weakly prime, because it can be changed into another prime (30855061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15427580 + 15427581.

It is an arithmetic number, because the mean of its divisors is an integer number (15427581).

Almost surely, 2^30855161 is an apocalyptic number.

It is an amenable number.

30855161 is a deficient number, since it is larger than the sum of its proper divisors (1).

30855161 is an equidigital number, since it uses as much as digits as its factorization.

30855161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 30855161 is about 5554.7422082397. The cubic root of 30855161 is about 313.6480599815.

The spelling of 30855161 in words is "thirty million, eight hundred fifty-five thousand, one hundred sixty-one".