51155789 has 4 divisors (see below), whose sum is σ = 51224124. Its totient is φ = 51087456.

The previous prime is 51155779. The next prime is 51155807. The reversal of 51155789 is 98755115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26574025 + 24581764 = 5155^2 + 4958^2 .

It is a cyclic number.

It is not a de Polignac number, because 51155789 - 2¹² = 51151693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155729) 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, 33032 + ... + 34545.

It is an arithmetic number, because the mean of its divisors is an integer number (12806031).

Almost surely, 2^51155789 is an apocalyptic number.

It is an amenable number.

51155789 is a deficient number, since it is larger than the sum of its proper divisors (68335).

51155789 is an equidigital number, since it uses as much as digits as its factorization.

51155789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68334.

The product of its digits is 63000, while the sum is 41.

The square root of 51155789 is about 7152.3275232612. The cubic root of 51155789 is about 371.2201960754.

The spelling of 51155789 in words is "fifty-one million, one hundred fifty-five thousand, seven hundred eighty-nine".