30001681 has 4 divisors (see below), whose sum is σ = 30015472. Its totient is φ = 29987892.

The previous prime is 30001669. The next prime is 30001693. The reversal of 30001681 is 18610003.

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 (30001669) and next prime (30001693).

It is a cyclic number.

It is not a de Polignac number, because 30001681 - 2⁷ = 30001553 is a prime.

It is a super-2 number, since 2×30001681² = 1800201725651522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30001781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2835 + ... + 8248.

It is an arithmetic number, because the mean of its divisors is an integer number (7503868).

Almost surely, 2^30001681 is an apocalyptic number.

It is an amenable number.

30001681 is a deficient number, since it is larger than the sum of its proper divisors (13791).

30001681 is a wasteful number, since it uses less digits than its factorization.

30001681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13790.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 30001681 is about 5477.3790265053. The cubic root of 30001681 is about 310.7290541068.

Adding to 30001681 its reverse (18610003), we get a palindrome (48611684).

The spelling of 30001681 in words is "thirty million, one thousand, six hundred eighty-one".