51380779 has 4 divisors (see below), whose sum is σ = 53152560. Its totient is φ = 49609000.

The previous prime is 51380737. The next prime is 51380789. The reversal of 51380779 is 97708315.

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 51380779 - 2²³ = 42992171 is a prime.

It is a super-3 number, since 3×51380779³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51380789) 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, 885847 + ... + 885904.

It is an arithmetic number, because the mean of its divisors is an integer number (13288140).

Almost surely, 2^51380779 is an apocalyptic number.

51380779 is a deficient number, since it is larger than the sum of its proper divisors (1771781).

51380779 is a wasteful number, since it uses less digits than its factorization.

51380779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771780.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 51380779 is about 7168.0387136231. The cubic root of 51380779 is about 371.7636255132.

The spelling of 51380779 in words is "fifty-one million, three hundred eighty thousand, seven hundred seventy-nine".