51031121 has 2 divisors, whose sum is σ = 51031122. Its totient is φ = 51031120.

The previous prime is 51031117. The next prime is 51031133. The reversal of 51031121 is 12113015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26419600 + 24611521 = 5140^2 + 4961^2 .

It is a cyclic number.

It is not a de Polignac number, because 51031121 - 2² = 51031117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51031096 and 51031105.

It is not a weakly prime, because it can be changed into another prime (51037121) 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, 25515560 + 25515561.

It is an arithmetic number, because the mean of its divisors is an integer number (25515561).

Almost surely, 2^51031121 is an apocalyptic number.

It is an amenable number.

51031121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51031121 is an equidigital number, since it uses as much as digits as its factorization.

51031121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 51031121 is about 7143.6070020684. The cubic root of 51031121 is about 370.9183929892.

Adding to 51031121 its reverse (12113015), we get a palindrome (63144136).

The spelling of 51031121 in words is "fifty-one million, thirty-one thousand, one hundred twenty-one".