51111211 has 2 divisors, whose sum is σ = 51111212. Its totient is φ = 51111210.

The previous prime is 51111199. The next prime is 51111217. The reversal of 51111211 is 11211115.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51111211 is a prime.

It is a super-2 number, since 2×51111211² = 5224711779773042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51111191 and 51111200.

It is not a weakly prime, because it can be changed into another prime (51111217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555605 + 25555606.

It is an arithmetic number, because the mean of its divisors is an integer number (25555606).

Almost surely, 2^51111211 is an apocalyptic number.

51111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

51111211 is an equidigital number, since it uses as much as digits as its factorization.

51111211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10, while the sum is 13.

The square root of 51111211 is about 7149.2105158542. The cubic root of 51111211 is about 371.1123356009.

Adding to 51111211 its reverse (11211115), we get a palindrome (62322326).

The spelling of 51111211 in words is "fifty-one million, one hundred eleven thousand, two hundred eleven".