30945161 has 12 divisors (see below), whose sum is σ = 34449156. Its totient is φ = 27632160.

The previous prime is 30945157. The next prime is 30945179. The reversal of 30945161 is 16154903.

It can be written as a sum of positive squares in 2 ways, for example, as 9610000 + 21335161 = 3100^2 + 4619^2 .

It is not a de Polignac number, because 30945161 - 2² = 30945157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30945121) 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 in 11 ways as a sum of consecutive naturals, for example, 11255 + ... + 13731.

It is an arithmetic number, because the mean of its divisors is an integer number (2870763).

Almost surely, 2^30945161 is an apocalyptic number.

30945161 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30945161 is a deficient number, since it is larger than the sum of its proper divisors (3503995).

30945161 is a wasteful number, since it uses less digits than its factorization.

30945161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552 (or 2521 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 30945161 is about 5562.8374953795. The cubic root of 30945161 is about 313.9527191579.

The spelling of 30945161 in words is "thirty million, nine hundred forty-five thousand, one hundred sixty-one".