51132420281 has 2 divisors, whose sum is σ = 51132420282. Its totient is φ = 51132420280.

The previous prime is 51132420263. The next prime is 51132420347. The reversal of 51132420281 is 18202423115.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51038039056 + 94381225 = 225916^2 + 9715^2 .

It is a cyclic number.

It is not a de Polignac number, because 51132420281 - 2¹⁸ = 51132158137 is a prime.

It is a super-2 number, since 2×51132420281² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51132420221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25566210140 + 25566210141.

It is an arithmetic number, because the mean of its divisors is an integer number (25566210141).

Almost surely, 2^51132420281 is an apocalyptic number.

It is an amenable number.

51132420281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51132420281 is an equidigital number, since it uses as much as digits as its factorization.

51132420281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 51132420281 its reverse (18202423115), we get a palindrome (69334843396).

The spelling of 51132420281 in words is "fifty-one billion, one hundred thirty-two million, four hundred twenty thousand, two hundred eighty-one".