51111217103 has 2 divisors, whose sum is σ = 51111217104. Its totient is φ = 51111217102.

The previous prime is 51111217061. The next prime is 51111217117. The reversal of 51111217103 is 30171211115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51111217103 - 2¹⁴ = 51111200719 is a prime.

It is a super-2 number, since 2×51111217103² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51111217123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555608551 + 25555608552.

It is an arithmetic number, because the mean of its divisors is an integer number (25555608552).

Almost surely, 2^51111217103 is an apocalyptic number.

51111217103 is a deficient number, since it is larger than the sum of its proper divisors (1).

51111217103 is an equidigital number, since it uses as much as digits as its factorization.

51111217103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 23.

Adding to 51111217103 its reverse (30171211115), we get a palindrome (81282428218).

The spelling of 51111217103 in words is "fifty-one billion, one hundred eleven million, two hundred seventeen thousand, one hundred three".