30085581 has 4 divisors (see below), whose sum is σ = 40114112. Its totient is φ = 20057052.

The previous prime is 30085571. The next prime is 30085589. The reversal of 30085581 is 18558003.

It is a happy number.

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 not a de Polignac number, because 30085581 - 2¹⁰ = 30084557 is a prime.

It is a super-2 number, since 2×30085581² = 1810284368215122, 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 (30085589) 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 3 ways as a sum of consecutive naturals, for example, 5014261 + ... + 5014266.

It is an arithmetic number, because the mean of its divisors is an integer number (10028528).

Almost surely, 2^30085581 is an apocalyptic number.

It is an amenable number.

30085581 is a deficient number, since it is larger than the sum of its proper divisors (10028531).

30085581 is a wasteful number, since it uses less digits than its factorization.

30085581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10028530.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 30085581 is about 5485.0324520462. The cubic root of 30085581 is about 311.0184368195.

The spelling of 30085581 in words is "thirty million, eighty-five thousand, five hundred eighty-one".