51111055 has 4 divisors (see below), whose sum is σ = 61333272. Its totient is φ = 40888840.

The previous prime is 51111031. The next prime is 51111089. The reversal of 51111055 is 55011115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-51111055 is a prime.

It is a super-2 number, since 2×51111055² = 5224679886426050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5111101 + ... + 5111110.

It is an arithmetic number, because the mean of its divisors is an integer number (15333318).

Almost surely, 2^51111055 is an apocalyptic number.

51111055 is a deficient number, since it is larger than the sum of its proper divisors (10222217).

51111055 is a wasteful number, since it uses less digits than its factorization.

51111055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10222216.

The product of its (nonzero) digits is 125, while the sum is 19.

The square root of 51111055 is about 7149.1996055503. The cubic root of 51111055 is about 371.1119580348. Note that the first 3 decimals are identical.

The spelling of 51111055 in words is "fifty-one million, one hundred eleven thousand, fifty-five".