51512011 has 2 divisors, whose sum is σ = 51512012. Its totient is φ = 51512010.

The previous prime is 51512009. The next prime is 51512039. The reversal of 51512011 is 11021515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51512011 - 2¹ = 51512009 is a prime.

Together with 51512009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51515011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756005 + 25756006.

It is an arithmetic number, because the mean of its divisors is an integer number (25756006).

Almost surely, 2^51512011 is an apocalyptic number.

51512011 is a deficient number, since it is larger than the sum of its proper divisors (1).

51512011 is an equidigital number, since it uses as much as digits as its factorization.

51512011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 51512011 is about 7177.1868444398. The cubic root of 51512011 is about 372.0798644383.

Adding to 51512011 its reverse (11021515), we get a palindrome (62533526).

The spelling of 51512011 in words is "fifty-one million, five hundred twelve thousand, eleven".