51208779 has 8 divisors (see below), whose sum is σ = 68371600. Its totient is φ = 34092576.

The previous prime is 51208763. The next prime is 51208783. The reversal of 51208779 is 97780215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51208779 - 2⁴ = 51208763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51208789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9004 + ... + 13545.

It is an arithmetic number, because the mean of its divisors is an integer number (8546450).

Almost surely, 2^51208779 is an apocalyptic number.

51208779 is a deficient number, since it is larger than the sum of its proper divisors (17162821).

51208779 is a wasteful number, since it uses less digits than its factorization.

51208779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23309.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 51208779 is about 7156.0309529795. The cubic root of 51208779 is about 371.3483286576.

The spelling of 51208779 in words is "fifty-one million, two hundred eight thousand, seven hundred seventy-nine".