51145779 has 4 divisors (see below), whose sum is σ = 68194376. Its totient is φ = 34097184.

The previous prime is 51145769. The next prime is 51145793. The reversal of 51145779 is 97754115.

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

It is not a de Polignac number, because 51145779 - 2¹³ = 51137587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51145709) 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, 8524294 + ... + 8524299.

It is an arithmetic number, because the mean of its divisors is an integer number (17048594).

Almost surely, 2^51145779 is an apocalyptic number.

51145779 is a deficient number, since it is larger than the sum of its proper divisors (17048597).

51145779 is a wasteful number, since it uses less digits than its factorization.

51145779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17048596.

The product of its digits is 44100, while the sum is 39.

The square root of 51145779 is about 7151.6277168208. The cubic root of 51145779 is about 371.1959814386.

The spelling of 51145779 in words is "fifty-one million, one hundred forty-five thousand, seven hundred seventy-nine".