51312071 has 2 divisors, whose sum is σ = 51312072. Its totient is φ = 51312070.

The previous prime is 51312061. The next prime is 51312091. The reversal of 51312071 is 17021315.

It is an a-pointer prime, because the next prime (51312091) can be obtained adding 51312071 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51312071 - 2²² = 47117767 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51312031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25656035 + 25656036.

It is an arithmetic number, because the mean of its divisors is an integer number (25656036).

Almost surely, 2^51312071 is an apocalyptic number.

51312071 is a deficient number, since it is larger than the sum of its proper divisors (1).

51312071 is an equidigital number, since it uses as much as digits as its factorization.

51312071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 51312071 is about 7163.2444464781. The cubic root of 51312071 is about 371.5978402407.

Adding to 51312071 its reverse (17021315), we get a palindrome (68333386).

The spelling of 51312071 in words is "fifty-one million, three hundred twelve thousand, seventy-one".