51212101 has 2 divisors, whose sum is σ = 51212102. Its totient is φ = 51212100.

The previous prime is 51212081. The next prime is 51212131. The reversal of 51212101 is 10121215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48233025 + 2979076 = 6945^2 + 1726^2 .

It is a cyclic number.

It is not a de Polignac number, because 51212101 - 2⁵ = 51212069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51212131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606050 + 25606051.

It is an arithmetic number, because the mean of its divisors is an integer number (25606051).

Almost surely, 2^51212101 is an apocalyptic number.

It is an amenable number.

51212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

51212101 is an equidigital number, since it uses as much as digits as its factorization.

51212101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 51212101 is about 7156.2630611235. The cubic root of 51212101 is about 371.3563584817.

Adding to 51212101 its reverse (10121215), we get a palindrome (61333316).

The spelling of 51212101 in words is "fifty-one million, two hundred twelve thousand, one hundred one".