30748181 has 8 divisors (see below), whose sum is σ = 31067160. Its totient is φ = 30431232.

The previous prime is 30748169. The next prime is 30748219. The reversal of 30748181 is 18184703.

It can be written as a sum of positive squares in 4 ways, for example, as 167281 + 30580900 = 409^2 + 5530^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30748181 - 2¹⁸ = 30486037 is a prime.

It is a super-2 number, since 2×30748181² = 1890901269617522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30742181) 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 7 ways as a sum of consecutive naturals, for example, 60155 + ... + 60663.

It is an arithmetic number, because the mean of its divisors is an integer number (3883395).

Almost surely, 2^30748181 is an apocalyptic number.

It is an amenable number.

30748181 is a deficient number, since it is larger than the sum of its proper divisors (318979).

30748181 is a wasteful number, since it uses less digits than its factorization.

30748181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 30748181 is about 5545.1042370726. The cubic root of 30748181 is about 313.2851501535.

The spelling of 30748181 in words is "thirty million, seven hundred forty-eight thousand, one hundred eighty-one".