30436948781 has 4 divisors (see below), whose sum is σ = 30438026172. Its totient is φ = 30435871392.

The previous prime is 30436948697. The next prime is 30436948793. The reversal of 30436948781 is 18784963403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18784963403 = 68041 ⋅276083.

It can be written as a sum of positive squares in 2 ways, for example, as 19591600900 + 10845347881 = 139970^2 + 104141^2 .

It is a cyclic number.

It is not a de Polignac number, because 30436948781 - 2¹⁰ = 30436947757 is a prime.

It is a super-2 number, since 2×30436948781² (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 (30436941781) 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, 495146 + ... + 553211.

It is an arithmetic number, because the mean of its divisors is an integer number (7609506543).

Almost surely, 2^30436948781 is an apocalyptic number.

It is an amenable number.

30436948781 is a deficient number, since it is larger than the sum of its proper divisors (1077391).

30436948781 is a wasteful number, since it uses less digits than its factorization.

30436948781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077390.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 30436948781 in words is "thirty billion, four hundred thirty-six million, nine hundred forty-eight thousand, seven hundred eighty-one".