52215139 has 4 divisors (see below), whose sum is σ = 52401240. Its totient is φ = 52029040.

The previous prime is 52215133. The next prime is 52215157. The reversal of 52215139 is 93151225.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 52215139 - 2³ = 52215131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52215131) 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, 92629 + ... + 93190.

It is an arithmetic number, because the mean of its divisors is an integer number (13100310).

Almost surely, 2^52215139 is an apocalyptic number.

52215139 is a deficient number, since it is larger than the sum of its proper divisors (186101).

52215139 is a wasteful number, since it uses less digits than its factorization.

52215139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186100.

The product of its digits is 2700, while the sum is 28.

The square root of 52215139 is about 7226.0043592569. The cubic root of 52215139 is about 373.7651565984.

The spelling of 52215139 in words is "fifty-two million, two hundred fifteen thousand, one hundred thirty-nine".