51120551 has 2 divisors, whose sum is σ = 51120552. Its totient is φ = 51120550.

The previous prime is 51120539. The next prime is 51120557. The reversal of 51120551 is 15502115.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51120551 is a prime.

It is a super-2 number, since 2×51120551² = 5226621469087202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51120557) 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, 25560275 + 25560276.

It is an arithmetic number, because the mean of its divisors is an integer number (25560276).

Almost surely, 2^51120551 is an apocalyptic number.

51120551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51120551 is an equidigital number, since it uses as much as digits as its factorization.

51120551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51120551 is about 7149.8637049947. The cubic root of 51120551 is about 371.1349397617.

Adding to 51120551 its reverse (15502115), we get a palindrome (66622666).

The spelling of 51120551 in words is "fifty-one million, one hundred twenty thousand, five hundred fifty-one".