51942779 has 4 divisors (see below), whose sum is σ = 59363184. Its totient is φ = 44522376.

The previous prime is 51942773. The next prime is 51942851. The reversal of 51942779 is 97724915.

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-51942779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51942773) 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, 3710192 + ... + 3710205.

It is an arithmetic number, because the mean of its divisors is an integer number (14840796).

Almost surely, 2^51942779 is an apocalyptic number.

51942779 is a deficient number, since it is larger than the sum of its proper divisors (7420405).

51942779 is an equidigital number, since it uses as much as digits as its factorization.

51942779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420404.

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

The square root of 51942779 is about 7207.1338963557. The cubic root of 51942779 is about 373.1141564449.

The spelling of 51942779 in words is "fifty-one million, nine hundred forty-two thousand, seven hundred seventy-nine".