51852391 has 4 divisors (see below), whose sum is σ = 52830792. Its totient is φ = 50873992.

The previous prime is 51852389. The next prime is 51852403. The reversal of 51852391 is 19325815.

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 51852391 - 2¹ = 51852389 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 (51852301) 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, 489121 + ... + 489226.

It is an arithmetic number, because the mean of its divisors is an integer number (13207698).

Almost surely, 2^51852391 is an apocalyptic number.

51852391 is a deficient number, since it is larger than the sum of its proper divisors (978401).

51852391 is an equidigital number, since it uses as much as digits as its factorization.

51852391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978400.

The product of its digits is 10800, while the sum is 34.

The square root of 51852391 is about 7200.8604346981. The cubic root of 51852391 is about 372.8976064635.

The spelling of 51852391 in words is "fifty-one million, eight hundred fifty-two thousand, three hundred ninety-one".