30654721 has 4 divisors (see below), whose sum is σ = 30850132. Its totient is φ = 30459312.

The previous prime is 30654677. The next prime is 30654727. The reversal of 30654721 is 12745603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12745603 = 13 ⋅980431.

It can be written as a sum of positive squares in 2 ways, for example, as 9678321 + 20976400 = 3111^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 30654721 - 2⁹ = 30654209 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 30654721.

It is not an unprimeable number, because it can be changed into a prime (30654727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97470 + ... + 97783.

It is an arithmetic number, because the mean of its divisors is an integer number (7712533).

Almost surely, 2^30654721 is an apocalyptic number.

It is an amenable number.

30654721 is a deficient number, since it is larger than the sum of its proper divisors (195411).

30654721 is a wasteful number, since it uses less digits than its factorization.

30654721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195410.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 30654721 is about 5536.6705699364. The cubic root of 30654721 is about 312.9674148728.

It can be divided in two parts, 30654 and 721, that added together give a triangular number (31375 = T₂₅₀).

The spelling of 30654721 in words is "thirty million, six hundred fifty-four thousand, seven hundred twenty-one".