30813161 has 4 divisors (see below), whose sum is σ = 30839424. Its totient is φ = 30786900.

The previous prime is 30813149. The next prime is 30813173. The reversal of 30813161 is 16131803.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (30813149) and next prime (30813173).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30813161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30813131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11285 + ... + 13746.

It is an arithmetic number, because the mean of its divisors is an integer number (7709856).

Almost surely, 2^30813161 is an apocalyptic number.

It is an amenable number.

30813161 is a deficient number, since it is larger than the sum of its proper divisors (26263).

30813161 is a wasteful number, since it uses less digits than its factorization.

30813161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26262.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 30813161 is about 5550.9603673599. The cubic root of 30813161 is about 313.5056829340.

Adding to 30813161 its reverse (16131803), we get a palindrome (46944964).

The spelling of 30813161 in words is "thirty million, eight hundred thirteen thousand, one hundred sixty-one".