30981421 has 8 divisors (see below), whose sum is σ = 31332600. Its totient is φ = 30632448.

The previous prime is 30981409. The next prime is 30981427. The reversal of 30981421 is 12418903.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1929321 + 29052100 = 1389^2 + 5390^2 .

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 30981421 - 2¹¹ = 30979373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30981421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30981427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49905 + ... + 50521.

It is an arithmetic number, because the mean of its divisors is an integer number (3916575).

Almost surely, 2^30981421 is an apocalyptic number.

It is an amenable number.

30981421 is a deficient number, since it is larger than the sum of its proper divisors (351179).

30981421 is a wasteful number, since it uses less digits than its factorization.

30981421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 30981421 is about 5566.0956693179. The cubic root of 30981421 is about 314.0752960192.

The spelling of 30981421 in words is "thirty million, nine hundred eighty-one thousand, four hundred twenty-one".