51210155 has 8 divisors (see below), whose sum is σ = 62143200. Its totient is φ = 40507456.

The previous prime is 51210151. The next prime is 51210169. The reversal of 51210155 is 55101215.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51210155 - 2² = 51210151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51210151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57095 + ... + 57984.

It is an arithmetic number, because the mean of its divisors is an integer number (7767900).

Almost surely, 2^51210155 is an apocalyptic number.

51210155 is a deficient number, since it is larger than the sum of its proper divisors (10933045).

51210155 is a wasteful number, since it uses less digits than its factorization.

51210155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115173.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51210155 is about 7156.1270950145. The cubic root of 51210155 is about 371.3516547196.

The spelling of 51210155 in words is "fifty-one million, two hundred ten thousand, one hundred fifty-five".