51155243 has 4 divisors (see below), whose sum is σ = 53379408. Its totient is φ = 48931080.

The previous prime is 51155189. The next prime is 51155257. The reversal of 51155243 is 34255115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34255115 = 5 ⋅6851023.

It is a cyclic number.

It is not a de Polignac number, because 51155243 - 2¹⁴ = 51138859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51155443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1112048 + ... + 1112093.

It is an arithmetic number, because the mean of its divisors is an integer number (13344852).

Almost surely, 2^51155243 is an apocalyptic number.

51155243 is a deficient number, since it is larger than the sum of its proper divisors (2224165).

51155243 is a wasteful number, since it uses less digits than its factorization.

51155243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224164.

The product of its digits is 3000, while the sum is 26.

The square root of 51155243 is about 7152.2893537664. The cubic root of 51155243 is about 371.2188753585.

The spelling of 51155243 in words is "fifty-one million, one hundred fifty-five thousand, two hundred forty-three".