51452861 has 2 divisors, whose sum is σ = 51452862. Its totient is φ = 51452860.

The previous prime is 51452857. The next prime is 51452879. The reversal of 51452861 is 16825415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31427236 + 20025625 = 5606^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 51452861 - 2² = 51452857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51452801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25726430 + 25726431.

It is an arithmetic number, because the mean of its divisors is an integer number (25726431).

Almost surely, 2^51452861 is an apocalyptic number.

It is an amenable number.

51452861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51452861 is an equidigital number, since it uses as much as digits as its factorization.

51452861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 32.

The square root of 51452861 is about 7173.0649655499. The cubic root of 51452861 is about 371.9373931137.

The spelling of 51452861 in words is "fifty-one million, four hundred fifty-two thousand, eight hundred sixty-one".