51967919 has 4 divisors (see below), whose sum is σ = 52064520. Its totient is φ = 51871320.

The previous prime is 51967891. The next prime is 51967933. The reversal of 51967919 is 91976915.

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 51967919 - 2²⁰ = 50919343 is a prime.

It is a super-2 number, since 2×51967919² = 5401329210381122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51967939) 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 in 3 ways as a sum of consecutive naturals, for example, 47489 + ... + 48570.

It is an arithmetic number, because the mean of its divisors is an integer number (13016130).

Almost surely, 2^51967919 is an apocalyptic number.

51967919 is a deficient number, since it is larger than the sum of its proper divisors (96601).

51967919 is an equidigital number, since it uses as much as digits as its factorization.

51967919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96600.

The product of its digits is 153090, while the sum is 47.

The square root of 51967919 is about 7208.8777906135. The cubic root of 51967919 is about 373.1743417563.

The spelling of 51967919 in words is "fifty-one million, nine hundred sixty-seven thousand, nine hundred nineteen".