51978349 has 4 divisors (see below), whose sum is σ = 52055136. Its totient is φ = 51901564.

The previous prime is 51978347. The next prime is 51978359. The reversal of 51978349 is 94387915.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51978349 - 2¹ = 51978347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51978299 and 51978308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51978341) 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 3 ways as a sum of consecutive naturals, for example, 37369 + ... + 38734.

It is an arithmetic number, because the mean of its divisors is an integer number (13013784).

Almost surely, 2^51978349 is an apocalyptic number.

It is an amenable number.

51978349 is a deficient number, since it is larger than the sum of its proper divisors (76787).

51978349 is an equidigital number, since it uses as much as digits as its factorization.

51978349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76786.

The product of its digits is 272160, while the sum is 46.

The square root of 51978349 is about 7209.6011678872. The cubic root of 51978349 is about 373.1993055423.

The spelling of 51978349 in words is "fifty-one million, nine hundred seventy-eight thousand, three hundred forty-nine".