538746781 has 4 divisors (see below), whose sum is σ = 538971552. Its totient is φ = 538522012.

The previous prime is 538746731. The next prime is 538746811. The reversal of 538746781 is 187647835.

It is a happy number.

538746781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 538746781 - 2¹³ = 538738589 is a prime.

It is a super-2 number, since 2×538746781² = 580496188075723922, which 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 (538746721) 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, 108751 + ... + 113596.

It is an arithmetic number, because the mean of its divisors is an integer number (134742888).

Almost surely, 2^538746781 is an apocalyptic number.

It is an amenable number.

538746781 is a deficient number, since it is larger than the sum of its proper divisors (224771).

538746781 is a wasteful number, since it uses less digits than its factorization.

538746781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224770.

The product of its digits is 1128960, while the sum is 49.

The square root of 538746781 is about 23210.9194346109. The cubic root of 538746781 is about 813.6948415149.

The spelling of 538746781 in words is "five hundred thirty-eight million, seven hundred forty-six thousand, seven hundred eighty-one".