51212071 has 2 divisors, whose sum is σ = 51212072. Its totient is φ = 51212070.

The previous prime is 51212069. The next prime is 51212081. The reversal of 51212071 is 17021215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51212071 - 2¹ = 51212069 is a prime.

It is a super-2 number, since 2×51212071² = 5245352432218082, which contains 22 as substring.

Together with 51212069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51212081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606035 + 25606036.

It is an arithmetic number, because the mean of its divisors is an integer number (25606036).

Almost surely, 2^51212071 is an apocalyptic number.

51212071 is a deficient number, since it is larger than the sum of its proper divisors (1).

51212071 is an equidigital number, since it uses as much as digits as its factorization.

51212071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 51212071 is about 7156.2609650571. The cubic root of 51212071 is about 371.3562859683.

Adding to 51212071 its reverse (17021215), we get a palindrome (68233286).

The spelling of 51212071 in words is "fifty-one million, two hundred twelve thousand, seventy-one".