51266261 has 2 divisors, whose sum is σ = 51266262. Its totient is φ = 51266260.

The previous prime is 51266251. The next prime is 51266269. The reversal of 51266261 is 16266215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47679025 + 3587236 = 6905^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 51266261 - 2¹⁰ = 51265237 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (51266269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25633130 + 25633131.

It is an arithmetic number, because the mean of its divisors is an integer number (25633131).

Almost surely, 2^51266261 is an apocalyptic number.

It is an amenable number.

51266261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51266261 is an equidigital number, since it uses as much as digits as its factorization.

51266261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 51266261 is about 7160.0461590691. The cubic root of 51266261 is about 371.4872232189.

The spelling of 51266261 in words is "fifty-one million, two hundred sixty-six thousand, two hundred sixty-one".