51217906 has 16 divisors (see below), whose sum is σ = 81648864. Its totient is φ = 24012864.

The previous prime is 51217891. The next prime is 51217927. The reversal of 51217906 is 60971215.

51217906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6961 + ... + 12283.

It is an arithmetic number, because the mean of its divisors is an integer number (5103054).

Almost surely, 2^51217906 is an apocalyptic number.

51217906 is a deficient number, since it is larger than the sum of its proper divisors (30430958).

51217906 is a wasteful number, since it uses less digits than its factorization.

51217906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 51217906 is about 7156.6686384099. The cubic root of 51217906 is about 371.3703892946.

The spelling of 51217906 in words is "fifty-one million, two hundred seventeen thousand, nine hundred six".