51432281 has 2 divisors, whose sum is σ = 51432282. Its totient is φ = 51432280.

The previous prime is 51432263. The next prime is 51432319. The reversal of 51432281 is 18223415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 737881 = 7120^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 51432281 - 2⁶ = 51432217 is a prime.

It is a super-2 number, since 2×51432281² = 5290559057725922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51432281.

It is not a weakly prime, because it can be changed into another prime (51432181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25716140 + 25716141.

It is an arithmetic number, because the mean of its divisors is an integer number (25716141).

Almost surely, 2^51432281 is an apocalyptic number.

It is an amenable number.

51432281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51432281 is an equidigital number, since it uses as much as digits as its factorization.

51432281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 51432281 is about 7171.6302888534. The cubic root of 51432281 is about 371.8877976059.

Adding to 51432281 its reverse (18223415), we get a palindrome (69655696).

The spelling of 51432281 in words is "fifty-one million, four hundred thirty-two thousand, two hundred eighty-one".