5621539 has 12 divisors (see below), whose sum is σ = 7062832. Its totient is φ = 4379760.

The previous prime is 5621513. The next prime is 5621597. The reversal of 5621539 is 9351265.

It is not a de Polignac number, because 5621539 - 2⁹ = 5621027 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

5621539 is a lucky number.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 5621539.

It is not an unprimeable number, because it can be changed into a prime (5621599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2472 + ... + 4165.

Almost surely, 2^5621539 is an apocalyptic number.

5621539 is a deficient number, since it is larger than the sum of its proper divisors (1441293).

5621539 is a wasteful number, since it uses less digits than its factorization.

5621539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6666 (or 6655 counting only the distinct ones).

The product of its digits is 8100, while the sum is 31.

The square root of 5621539 is about 2370.9784899910. The cubic root of 5621539 is about 177.8081824588.

The spelling of 5621539 in words is "five million, six hundred twenty-one thousand, five hundred thirty-nine".