51550931 has 2 divisors, whose sum is σ = 51550932. Its totient is φ = 51550930.

The previous prime is 51550913. The next prime is 51550969. The reversal of 51550931 is 13905515.

It is a happy number.

51550931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (51550913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51550931 - 2⁶ = 51550867 is a prime.

It is a super-2 number, since 2×51550931² = 5314996973933522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51550894 and 51550903.

It is not a weakly prime, because it can be changed into another prime (51550991) 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 as a sum of consecutive naturals, namely, 25775465 + 25775466.

It is an arithmetic number, because the mean of its divisors is an integer number (25775466).

Almost surely, 2^51550931 is an apocalyptic number.

51550931 is a deficient number, since it is larger than the sum of its proper divisors (1).

51550931 is an equidigital number, since it uses as much as digits as its factorization.

51550931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3375, while the sum is 29.

The square root of 51550931 is about 7179.8977012211. The cubic root of 51550931 is about 372.1735494025.

The spelling of 51550931 in words is "fifty-one million, five hundred fifty thousand, nine hundred thirty-one".