51979247 has 4 divisors (see below), whose sum is σ = 52136616. Its totient is φ = 51821880.

The previous prime is 51979243. The next prime is 51979283. The reversal of 51979247 is 74297915.

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 51979247 - 2² = 51979243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51979198 and 51979207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51979243) 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, 78188 + ... + 78849.

It is an arithmetic number, because the mean of its divisors is an integer number (13034154).

Almost surely, 2^51979247 is an apocalyptic number.

51979247 is a deficient number, since it is larger than the sum of its proper divisors (157369).

51979247 is a wasteful number, since it uses less digits than its factorization.

51979247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157368.

The product of its digits is 158760, while the sum is 44.

The square root of 51979247 is about 7209.6634456818. The cubic root of 51979247 is about 373.2014547131.

The spelling of 51979247 in words is "fifty-one million, nine hundred seventy-nine thousand, two hundred forty-seven".