51051555 has 12 divisors (see below), whose sum is σ = 88489440. Its totient is φ = 27227472.

The previous prime is 51051547. The next prime is 51051563. The reversal of 51051555 is 55515015.

51051555 is a `hidden beast` number, since 5 + 105 + 1 + 555 = 666.

51051555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51051547) and next prime (51051563).

It is not a de Polignac number, because 51051555 - 2³ = 51051547 is a prime.

It is a super-2 number, since 2×51051555² = 5212522535836050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 567195 + ... + 567284.

It is an arithmetic number, because the mean of its divisors is an integer number (7374120).

Almost surely, 2^51051555 is an apocalyptic number.

51051555 is a deficient number, since it is larger than the sum of its proper divisors (37437885).

51051555 is a wasteful number, since it uses less digits than its factorization.

51051555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134490 (or 1134487 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 27.

The square root of 51051555 is about 7145.0370887771. The cubic root of 51051555 is about 370.9678943841.

The spelling of 51051555 in words is "fifty-one million, fifty-one thousand, five hundred fifty-five".