52136813 has 4 divisors (see below), whose sum is σ = 52170300. Its totient is φ = 52103328.

The previous prime is 52136783. The next prime is 52136831. The reversal of 52136813 is 31863125.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11202409 + 40934404 = 3347^2 + 6398^2 .

It is a cyclic number.

It is not a de Polignac number, because 52136813 - 2¹⁶ = 52071277 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 (52136863) 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, 14288 + ... + 17561.

It is an arithmetic number, because the mean of its divisors is an integer number (13042575).

Almost surely, 2^52136813 is an apocalyptic number.

It is an amenable number.

52136813 is a deficient number, since it is larger than the sum of its proper divisors (33487).

52136813 is a wasteful number, since it uses less digits than its factorization.

52136813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33486.

The product of its digits is 4320, while the sum is 29.

The square root of 52136813 is about 7220.5825942233. The cubic root of 52136813 is about 373.5781726392.

Adding to 52136813 its reverse (31863125), we get a palindrome (83999938).

The spelling of 52136813 in words is "fifty-two million, one hundred thirty-six thousand, eight hundred thirteen".