51212151 has 24 divisors (see below), whose sum is σ = 76186656. Its totient is φ = 33134400.

The previous prime is 51212137. The next prime is 51212159. The reversal of 51212151 is 15121215.

51212151 is a `hidden beast` number, since 512 + 1 + 2 + 151 = 666.

It is not a de Polignac number, because 51212151 - 2¹³ = 51203959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47646 + ... + 48708.

It is an arithmetic number, because the mean of its divisors is an integer number (3174444).

Almost surely, 2^51212151 is an apocalyptic number.

51212151 is a deficient number, since it is larger than the sum of its proper divisors (24974505).

51212151 is a wasteful number, since it uses less digits than its factorization.

51212151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223 (or 1220 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 51212151 is about 7156.2665545660. The cubic root of 51212151 is about 371.3564793374.

Adding to 51212151 its reverse (15121215), we get a palindrome (66333366).

The spelling of 51212151 in words is "fifty-one million, two hundred twelve thousand, one hundred fifty-one".