51230155 has 4 divisors (see below), whose sum is σ = 61476192. Its totient is φ = 40984120.

The previous prime is 51230147. The next prime is 51230161. The reversal of 51230155 is 55103215.

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

It is not a de Polignac number, because 51230155 - 2³ = 51230147 is a prime.

It is a Smith number, since the sum of its digits (22) 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5123011 + ... + 5123020.

It is an arithmetic number, because the mean of its divisors is an integer number (15369048).

Almost surely, 2^51230155 is an apocalyptic number.

51230155 is a deficient number, since it is larger than the sum of its proper divisors (10246037).

51230155 is a wasteful number, since it uses less digits than its factorization.

51230155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10246036.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51230155 is about 7157.5243625153. The cubic root of 51230155 is about 371.3999919191.

The spelling of 51230155 in words is "fifty-one million, two hundred thirty thousand, one hundred fifty-five".