51820011 has 24 divisors (see below), whose sum is σ = 79984320. Its totient is φ = 32232816.

The previous prime is 51820009. The next prime is 51820037. The reversal of 51820011 is 11002815.

It is not a de Polignac number, because 51820011 - 2¹ = 51820009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51820001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9196 + ... + 13718.

It is an arithmetic number, because the mean of its divisors is an integer number (3332680).

Almost surely, 2^51820011 is an apocalyptic number.

51820011 is a deficient number, since it is larger than the sum of its proper divisors (28164309).

51820011 is a wasteful number, since it uses less digits than its factorization.

51820011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615 (or 4612 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 51820011 is about 7198.6117411623. The cubic root of 51820011 is about 372.8199698076.

Adding to 51820011 its reverse (11002815), we get a palindrome (62822826).

The spelling of 51820011 in words is "fifty-one million, eight hundred twenty thousand, eleven".