51011123 has 4 divisors (see below), whose sum is σ = 52389840. Its totient is φ = 49632408.

The previous prime is 51011117. The next prime is 51011131. The reversal of 51011123 is 32111015.

51011123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32111015 = 5 ⋅6422203.

It is a cyclic number.

It is not a de Polignac number, because 51011123 - 2¹⁸ = 50748979 is a prime.

It is a super-2 number, since 2×51011123² = 5204269339442258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51011098 and 51011107.

It is not an unprimeable number, because it can be changed into a prime (51011113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689303 + ... + 689376.

It is an arithmetic number, because the mean of its divisors is an integer number (13097460).

Almost surely, 2^51011123 is an apocalyptic number.

51011123 is a deficient number, since it is larger than the sum of its proper divisors (1378717).

51011123 is a wasteful number, since it uses less digits than its factorization.

51011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378716.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 51011123 is about 7142.2071518544. The cubic root of 51011123 is about 370.8699350089.

Adding to 51011123 its reverse (32111015), we get a palindrome (83122138).

The spelling of 51011123 in words is "fifty-one million, eleven thousand, one hundred twenty-three".