51145551 has 6 divisors (see below), whose sum is σ = 73876920. Its totient is φ = 34097028.

The previous prime is 51145519. The next prime is 51145553. The reversal of 51145551 is 15554115.

It is not a de Polignac number, because 51145551 - 2⁵ = 51145519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2841411 + ... + 2841428.

It is an arithmetic number, because the mean of its divisors is an integer number (12312820).

Almost surely, 2^51145551 is an apocalyptic number.

51145551 is a deficient number, since it is larger than the sum of its proper divisors (22731369).

51145551 is a wasteful number, since it uses less digits than its factorization.

51145551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5682845 (or 5682842 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 51145551 is about 7151.6117763760. The cubic root of 51145551 is about 371.1954298596.

Adding to 51145551 its reverse (15554115), we get a palindrome (66699666).

The spelling of 51145551 in words is "fifty-one million, one hundred forty-five thousand, five hundred fifty-one".