538547021 has 4 divisors (see below), whose sum is σ = 542421600. Its totient is φ = 534672444.

The previous prime is 538547017. The next prime is 538547027. The reversal of 538547021 is 120745835.

It is a happy number.

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 538547021 - 2² = 538547017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538547027) 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, 1937081 + ... + 1937358.

It is an arithmetic number, because the mean of its divisors is an integer number (135605400).

Almost surely, 2^538547021 is an apocalyptic number.

It is an amenable number.

538547021 is a deficient number, since it is larger than the sum of its proper divisors (3874579).

538547021 is a wasteful number, since it uses less digits than its factorization.

538547021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874578.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 538547021 is about 23206.6158885780. The cubic root of 538547021 is about 813.5942600785.

The spelling of 538547021 in words is "five hundred thirty-eight million, five hundred forty-seven thousand, twenty-one".