51515011 has 2 divisors, whose sum is σ = 51515012. Its totient is φ = 51515010.

The previous prime is 51515003. The next prime is 51515021. The reversal of 51515011 is 11051515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51515011 - 2³ = 51515003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51515011.

It is not a weakly prime, because it can be changed into another prime (51515021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757505 + 25757506.

It is an arithmetic number, because the mean of its divisors is an integer number (25757506).

Almost surely, 2^51515011 is an apocalyptic number.

51515011 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515011 is an equidigital number, since it uses as much as digits as its factorization.

51515011 is an evil number, because the sum of its binary digits is even.

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

The square root of 51515011 is about 7177.3958369314. The cubic root of 51515011 is about 372.0870874652.

Adding to 51515011 its reverse (11051515), we get a palindrome (62566526).

The spelling of 51515011 in words is "fifty-one million, five hundred fifteen thousand, eleven".