55539021 has 8 divisors (see below), whose sum is σ = 74348064. Its totient is φ = 36878000.

The previous prime is 55539019. The next prime is 55539037. The reversal of 55539021 is 12093555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55539021 - 2¹ = 55539019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55539021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55539041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36126 + ... + 37631.

It is an arithmetic number, because the mean of its divisors is an integer number (9293508).

Almost surely, 2^55539021 is an apocalyptic number.

It is an amenable number.

55539021 is a deficient number, since it is larger than the sum of its proper divisors (18809043).

55539021 is a wasteful number, since it uses less digits than its factorization.

55539021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74011.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 55539021 is about 7452.4506707525. The cubic root of 55539021 is about 381.5335557459.

The spelling of 55539021 in words is "fifty-five million, five hundred thirty-nine thousand, twenty-one".