51109551 has 6 divisors (see below), whose sum is σ = 73824920. Its totient is φ = 34073028.

The previous prime is 51109549. The next prime is 51109559. The reversal of 51109551 is 15590115.

51109551 is a `hidden beast` number, since 5 + 1 + 109 + 551 = 666.

It is not a de Polignac number, because 51109551 - 2¹ = 51109549 is a prime.

It is a super-2 number, since 2×51109551² = 5224372406843202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51109559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2839411 + ... + 2839428.

Almost surely, 2^51109551 is an apocalyptic number.

51109551 is a deficient number, since it is larger than the sum of its proper divisors (22715369).

51109551 is a wasteful number, since it uses less digits than its factorization.

51109551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5678845 (or 5678842 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 27.

The square root of 51109551 is about 7149.0944181763. The cubic root of 51109551 is about 371.1083178708.

Adding to 51109551 its reverse (15590115), we get a palindrome (66699666).

The spelling of 51109551 in words is "fifty-one million, one hundred nine thousand, five hundred fifty-one".