52191813 has 8 divisors (see below), whose sum is σ = 70768800. Its totient is φ = 34204688.

The previous prime is 52191781. The next prime is 52191847. The reversal of 52191813 is 31819125.

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 52191813 - 2⁵ = 52191781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52191863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147258 + ... + 147611.

It is an arithmetic number, because the mean of its divisors is an integer number (8846100).

Almost surely, 2^52191813 is an apocalyptic number.

It is an amenable number.

52191813 is a deficient number, since it is larger than the sum of its proper divisors (18576987).

52191813 is a wasteful number, since it uses less digits than its factorization.

52191813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294931.

The product of its digits is 2160, while the sum is 30.

The square root of 52191813 is about 7224.3901472719. The cubic root of 52191813 is about 373.7094911037.

The spelling of 52191813 in words is "fifty-two million, one hundred ninety-one thousand, eight hundred thirteen".