52215518 has 4 divisors (see below), whose sum is σ = 78323280. Its totient is φ = 26107758.

The previous prime is 52215511. The next prime is 52215529. The reversal of 52215518 is 81551225.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52215511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13053878 + ... + 13053881.

It is an arithmetic number, because the mean of its divisors is an integer number (19580820).

Almost surely, 2^52215518 is an apocalyptic number.

52215518 is a deficient number, since it is larger than the sum of its proper divisors (26107762).

52215518 is a wasteful number, since it uses less digits than its factorization.

52215518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26107761.

The product of its digits is 4000, while the sum is 29.

The square root of 52215518 is about 7226.0305839375. The cubic root of 52215518 is about 373.7660609124.

The spelling of 52215518 in words is "fifty-two million, two hundred fifteen thousand, five hundred eighteen".