51115510 has 16 divisors (see below), whose sum is σ = 96850800. Its totient is φ = 19370016.

The previous prime is 51115483. The next prime is 51115511. The reversal of 51115510 is 1551115.

It is a happy number.

It is a super-2 number, since 2×51115510² = 5225590725120200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115511) 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 7 ways as a sum of consecutive naturals, for example, 134325 + ... + 134704.

It is an arithmetic number, because the mean of its divisors is an integer number (6053175).

Almost surely, 2^51115510 is an apocalyptic number.

51115510 is a deficient number, since it is larger than the sum of its proper divisors (45735290).

51115510 is a wasteful number, since it uses less digits than its factorization.

51115510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269055.

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

The square root of 51115510 is about 7149.5111721012. The cubic root of 51115510 is about 371.1227401492.

Adding to 51115510 its reverse (1551115), we get a palindrome (52666625).

The spelling of 51115510 in words is "fifty-one million, one hundred fifteen thousand, five hundred ten".