51211655 has 16 divisors (see below), whose sum is σ = 67392000. Its totient is φ = 37049760.

The previous prime is 51211627. The next prime is 51211679. The reversal of 51211655 is 55611215.

It is not a de Polignac number, because 51211655 - 2¹⁰ = 51210631 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8606 + ... + 13284.

It is an arithmetic number, because the mean of its divisors is an integer number (4212000).

Almost surely, 2^51211655 is an apocalyptic number.

51211655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51211655 is a deficient number, since it is larger than the sum of its proper divisors (16180345).

51211655 is a wasteful number, since it uses less digits than its factorization.

51211655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4894.

The product of its digits is 1500, while the sum is 26.

The square root of 51211655 is about 7156.2318995404. The cubic root of 51211655 is about 371.3552804461.

It can be divided in two parts, 5121 and 1655, that added together give a palindrome (6776).

The spelling of 51211655 in words is "fifty-one million, two hundred eleven thousand, six hundred fifty-five".