51517121 has 2 divisors, whose sum is σ = 51517122. Its totient is φ = 51517120.

The previous prime is 51517111. The next prime is 51517159. The reversal of 51517121 is 12171515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26666896 + 24850225 = 5164^2 + 4985^2 .

It is a cyclic number.

It is not a de Polignac number, because 51517121 - 2¹⁰ = 51516097 is a prime.

It is a super-2 number, since 2×51517121² = 5308027512257282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51517111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25758560 + 25758561.

It is an arithmetic number, because the mean of its divisors is an integer number (25758561).

Almost surely, 2^51517121 is an apocalyptic number.

It is an amenable number.

51517121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51517121 is an equidigital number, since it uses as much as digits as its factorization.

51517121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 350, while the sum is 23.

The square root of 51517121 is about 7177.5428246720. The cubic root of 51517121 is about 372.0921674928.

Adding to 51517121 its reverse (12171515), we get a palindrome (63688636).

The spelling of 51517121 in words is "fifty-one million, five hundred seventeen thousand, one hundred twenty-one".