51964399 has 4 divisors (see below), whose sum is σ = 52479000. Its totient is φ = 51449800.

The previous prime is 51964379. The next prime is 51964417. The reversal of 51964399 is 99346915.

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 51964399 - 2¹⁹ = 51440111 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 (51964379) 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, 257149 + ... + 257350.

It is an arithmetic number, because the mean of its divisors is an integer number (13119750).

Almost surely, 2^51964399 is an apocalyptic number.

51964399 is a deficient number, since it is larger than the sum of its proper divisors (514601).

51964399 is a wasteful number, since it uses less digits than its factorization.

51964399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514600.

The product of its digits is 262440, while the sum is 46.

The square root of 51964399 is about 7208.6336430700. The cubic root of 51964399 is about 373.1659160239.

The spelling of 51964399 in words is "fifty-one million, nine hundred sixty-four thousand, three hundred ninety-nine".