51224155 has 4 divisors (see below), whose sum is σ = 61468992. Its totient is φ = 40979320.

The previous prime is 51224101. The next prime is 51224161. The reversal of 51224155 is 55142215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55142215 = 5 ⋅11028443.

It is not a de Polignac number, because 51224155 - 2¹¹ = 51222107 is a prime.

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, 5122411 + ... + 5122420.

It is an arithmetic number, because the mean of its divisors is an integer number (15367248).

Almost surely, 2^51224155 is an apocalyptic number.

51224155 is a deficient number, since it is larger than the sum of its proper divisors (10244837).

51224155 is a wasteful number, since it uses less digits than its factorization.

51224155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244836.

The product of its digits is 2000, while the sum is 25.

The square root of 51224155 is about 7157.1052109075. The cubic root of 51224155 is about 371.3854920804.

The spelling of 51224155 in words is "fifty-one million, two hundred twenty-four thousand, one hundred fifty-five".