51011911 has 2 divisors, whose sum is σ = 51011912. Its totient is φ = 51011910.

The previous prime is 51011881. The next prime is 51011923. The reversal of 51011911 is 11911015.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51011911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51011971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25505955 + 25505956.

It is an arithmetic number, because the mean of its divisors is an integer number (25505956).

Almost surely, 2^51011911 is an apocalyptic number.

51011911 is a deficient number, since it is larger than the sum of its proper divisors (1).

51011911 is an equidigital number, since it uses as much as digits as its factorization.

51011911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45, while the sum is 19.

The square root of 51011911 is about 7142.2623166613. The cubic root of 51011911 is about 370.8718446840.

Adding to 51011911 its reverse (11911015), we get a palindrome (62922926).

It can be divided in two parts, 510 and 11911, that added together give a palindrome (12421).

The spelling of 51011911 in words is "fifty-one million, eleven thousand, nine hundred eleven".