51505123 has 2 divisors, whose sum is σ = 51505124. Its totient is φ = 51505122.

The previous prime is 51505109. The next prime is 51505127. The reversal of 51505123 is 32150515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51505123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51505094 and 51505103.

It is not a weakly prime, because it can be changed into another prime (51505127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25752561 + 25752562.

It is an arithmetic number, because the mean of its divisors is an integer number (25752562).

Almost surely, 2^51505123 is an apocalyptic number.

51505123 is a deficient number, since it is larger than the sum of its proper divisors (1).

51505123 is an equidigital number, since it uses as much as digits as its factorization.

51505123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51505123 is about 7176.7069746507. The cubic root of 51505123 is about 372.0632793073.

Adding to 51505123 its reverse (32150515), we get a palindrome (83655638).

It can be divided in two parts, 5150512 and 3, that added together give a palindrome (5150515).

The spelling of 51505123 in words is "fifty-one million, five hundred five thousand, one hundred twenty-three".