51540161 has 2 divisors, whose sum is σ = 51540162. Its totient is φ = 51540160.

The previous prime is 51540121. The next prime is 51540191. The reversal of 51540161 is 16104515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 59536 = 7175^2 + 244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51540161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51540121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25770080 + 25770081.

It is an arithmetic number, because the mean of its divisors is an integer number (25770081).

Almost surely, 2^51540161 is an apocalyptic number.

It is an amenable number.

51540161 is a deficient number, since it is larger than the sum of its proper divisors (1).

51540161 is an equidigital number, since it uses as much as digits as its factorization.

51540161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 51540161 is about 7179.1476513581. The cubic root of 51540161 is about 372.1476294807.

Adding to 51540161 its reverse (16104515), we get a palindrome (67644676).

The spelling of 51540161 in words is "fifty-one million, five hundred forty thousand, one hundred sixty-one".