51212069 has 2 divisors, whose sum is σ = 51212070. Its totient is φ = 51212068.

The previous prime is 51212047. The next prime is 51212071. The reversal of 51212069 is 96021215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47789569 + 3422500 = 6913^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 51212069 - 2⁸ = 51211813 is a prime.

It is a super-2 number, since 2×51212069² = 5245352022521522, which contains 22 as substring.

Together with 51212071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51212009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606034 + 25606035.

It is an arithmetic number, because the mean of its divisors is an integer number (25606035).

Almost surely, 2^51212069 is an apocalyptic number.

It is an amenable number.

51212069 is a deficient number, since it is larger than the sum of its proper divisors (1).

51212069 is an equidigital number, since it uses as much as digits as its factorization.

51212069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51212069 is about 7156.2608253193. The cubic root of 51212069 is about 371.3562811341.

It can be divided in two parts, 5121206 and 9, that added together give a palindrome (5121215).

The spelling of 51212069 in words is "fifty-one million, two hundred twelve thousand, sixty-nine".