30288981 has 4 divisors (see below), whose sum is σ = 40385312. Its totient is φ = 20192652.

The previous prime is 30288961. The next prime is 30288989. The reversal of 30288981 is 18988203.

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 30288981 - 2¹⁸ = 30026837 is a prime.

It is a super-2 number, since 2×30288981² = 1834844740036722, 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 (30288989) 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, 5048161 + ... + 5048166.

It is an arithmetic number, because the mean of its divisors is an integer number (10096328).

Almost surely, 2^30288981 is an apocalyptic number.

It is an amenable number.

30288981 is a deficient number, since it is larger than the sum of its proper divisors (10096331).

30288981 is a wasteful number, since it uses less digits than its factorization.

30288981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10096330.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 30288981 is about 5503.5425863711. The cubic root of 30288981 is about 311.7177653960.

The spelling of 30288981 in words is "thirty million, two hundred eighty-eight thousand, nine hundred eighty-one".