51505011 has 8 divisors (see below), whose sum is σ = 76303760. Its totient is φ = 34336656.

The previous prime is 51505009. The next prime is 51505031. The reversal of 51505011 is 11050515.

It is not a de Polignac number, because 51505011 - 2¹ = 51505009 is a prime.

It is a super-2 number, since 2×51505011² = 5305532316220242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51505001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953770 + ... + 953823.

It is an arithmetic number, because the mean of its divisors is an integer number (9537970).

Almost surely, 2^51505011 is an apocalyptic number.

51505011 is a deficient number, since it is larger than the sum of its proper divisors (24798749).

51505011 is a wasteful number, since it uses less digits than its factorization.

51505011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907602 (or 1907596 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 18.

The square root of 51505011 is about 7176.6991716248. The cubic root of 51505011 is about 372.0630096181.

Adding to 51505011 its reverse (11050515), we get a palindrome (62555526).

The spelling of 51505011 in words is "fifty-one million, five hundred five thousand, eleven".