30479454781 has 4 divisors (see below), whose sum is σ = 30479904700. Its totient is φ = 30479004864.

The previous prime is 30479454671. The next prime is 30479454829. The reversal of 30479454781 is 18745497403.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18745497403 = 5077 ⋅3692239.

It can be written as a sum of positive squares in 2 ways, for example, as 3013021881 + 27466432900 = 54891^2 + 165730^2 .

It is a cyclic number.

It is not a de Polignac number, because 30479454781 - 2¹¹ = 30479452733 is a prime.

It is a super-2 number, since 2×30479454781² (a number of 22 digits) 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 (30479451781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100326 + ... + 266503.

It is an arithmetic number, because the mean of its divisors is an integer number (7619976175).

Almost surely, 2^30479454781 is an apocalyptic number.

It is an amenable number.

30479454781 is a deficient number, since it is larger than the sum of its proper divisors (449919).

30479454781 is an equidigital number, since it uses as much as digits as its factorization.

30479454781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449918.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 30479454781 in words is "thirty billion, four hundred seventy-nine million, four hundred fifty-four thousand, seven hundred eighty-one".