51121155 has 32 divisors (see below), whose sum is σ = 83592000. Its totient is φ = 26673152.

The previous prime is 51121141. The next prime is 51121163. The reversal of 51121155 is 55112115.

51121155 is nontrivially palindromic in base 16.

It is a cyclic number.

It is not a de Polignac number, because 51121155 - 2⁵ = 51121123 is a prime.

It is a super-2 number, since 2×51121155² = 5226744977068050, which contains 22 as substring.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198787 + ... + 199043.

It is an arithmetic number, because the mean of its divisors is an integer number (2612250).

Almost surely, 2^51121155 is an apocalyptic number.

51121155 is a deficient number, since it is larger than the sum of its proper divisors (32470845).

51121155 is a wasteful number, since it uses less digits than its factorization.

51121155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

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

The square root of 51121155 is about 7149.9059434373. The cubic root of 51121155 is about 371.1364014349.

The spelling of 51121155 in words is "fifty-one million, one hundred twenty-one thousand, one hundred fifty-five".