51211155 has 8 divisors (see below), whose sum is σ = 81937872. Its totient is φ = 27312608.

The previous prime is 51211117. The next prime is 51211159. The reversal of 51211155 is 55111215.

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 51211155 - 2⁸ = 51210899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51211159) 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, 1707024 + ... + 1707053.

It is an arithmetic number, because the mean of its divisors is an integer number (10242234).

Almost surely, 2^51211155 is an apocalyptic number.

51211155 is a deficient number, since it is larger than the sum of its proper divisors (30726717).

51211155 is a wasteful number, since it uses less digits than its factorization.

51211155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414085.

The product of its digits is 250, while the sum is 21.

The square root of 51211155 is about 7156.1969648690. The cubic root of 51211155 is about 371.3540718784.

The spelling of 51211155 in words is "fifty-one million, two hundred eleven thousand, one hundred fifty-five".