51384779 has 4 divisors (see below), whose sum is σ = 52151784. Its totient is φ = 50617776.

The previous prime is 51384769. The next prime is 51384787. The reversal of 51384779 is 97748315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51384779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51384709) 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, 383402 + ... + 383535.

It is an arithmetic number, because the mean of its divisors is an integer number (13037946).

Almost surely, 2^51384779 is an apocalyptic number.

51384779 is a deficient number, since it is larger than the sum of its proper divisors (767005).

51384779 is an equidigital number, since it uses as much as digits as its factorization.

51384779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767004.

The product of its digits is 211680, while the sum is 44.

The square root of 51384779 is about 7168.3177245432. The cubic root of 51384779 is about 371.7732725443.

The spelling of 51384779 in words is "fifty-one million, three hundred eighty-four thousand, seven hundred seventy-nine".