51202813 has 2 divisors, whose sum is σ = 51202814. Its totient is φ = 51202812.

The previous prime is 51202757. The next prime is 51202819. The reversal of 51202813 is 31820215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32867289 + 18335524 = 5733^2 + 4282^2 .

It is a cyclic number.

It is not a de Polignac number, because 51202813 - 2²⁵ = 17648381 is a prime.

It is a super-2 number, since 2×51202813² = 5243456118225938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51202819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25601406 + 25601407.

It is an arithmetic number, because the mean of its divisors is an integer number (25601407).

Almost surely, 2^51202813 is an apocalyptic number.

It is an amenable number.

51202813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51202813 is an equidigital number, since it uses as much as digits as its factorization.

51202813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 51202813 is about 7155.6140896502. The cubic root of 51202813 is about 371.3339069756. Note that the first 3 decimals are identical.

The spelling of 51202813 in words is "fifty-one million, two hundred two thousand, eight hundred thirteen".