51436813 has 2 divisors, whose sum is σ = 51436814. Its totient is φ = 51436812.

The previous prime is 51436799. The next prime is 51436823. The reversal of 51436813 is 31863415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46758244 + 4678569 = 6838^2 + 2163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51436813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51436823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25718406 + 25718407.

It is an arithmetic number, because the mean of its divisors is an integer number (25718407).

Almost surely, 2^51436813 is an apocalyptic number.

It is an amenable number.

51436813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51436813 is an equidigital number, since it uses as much as digits as its factorization.

51436813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 51436813 is about 7171.9462491014. The cubic root of 51436813 is about 371.8987203569.

The spelling of 51436813 in words is "fifty-one million, four hundred thirty-six thousand, eight hundred thirteen".