51406215 has 64 divisors (see below), whose sum is σ = 102850560. Its totient is φ = 21381120.

The previous prime is 51406213. The next prime is 51406279. The reversal of 51406215 is 51260415.

It is not a de Polignac number, because 51406215 - 2¹ = 51406213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51406211) 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 63 ways as a sum of consecutive naturals, for example, 54871 + ... + 55799.

It is an arithmetic number, because the mean of its divisors is an integer number (1607040).

Almost surely, 2^51406215 is an apocalyptic number.

51406215 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

51406215 is a wasteful number, since it uses less digits than its factorization.

51406215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 51406215 is about 7169.8127590614. The cubic root of 51406215 is about 371.8249624552.

The spelling of 51406215 in words is "fifty-one million, four hundred six thousand, two hundred fifteen".