51250061 has 2 divisors, whose sum is σ = 51250062. Its totient is φ = 51250060.

The previous prime is 51250057. The next prime is 51250081. The reversal of 51250061 is 16005215.

It is an a-pointer prime, because the next prime (51250081) can be obtained adding 51250061 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37515625 + 13734436 = 6125^2 + 3706^2 .

It is a cyclic number.

It is not a de Polignac number, because 51250061 - 2² = 51250057 is a 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 (51250081) 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, 25625030 + 25625031.

It is an arithmetic number, because the mean of its divisors is an integer number (25625031).

Almost surely, 2^51250061 is an apocalyptic number.

It is an amenable number.

51250061 is a deficient number, since it is larger than the sum of its proper divisors (1).

51250061 is an equidigital number, since it uses as much as digits as its factorization.

51250061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51250061 is about 7158.9147920617. The cubic root of 51250061 is about 371.4480894435.

Adding to 51250061 its reverse (16005215), we get a palindrome (67255276).

The spelling of 51250061 in words is "fifty-one million, two hundred fifty thousand, sixty-one".