51251269 has 2 divisors, whose sum is σ = 51251270. Its totient is φ = 51251268.

The previous prime is 51251219. The next prime is 51251287. The reversal of 51251269 is 96215215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32433025 + 18818244 = 5695^2 + 4338^2 .

It is a cyclic number.

It is not a de Polignac number, because 51251269 - 2¹⁹ = 50726981 is a prime.

It is a super-2 number, since 2×51251269² = 5253385148220722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51251269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51251219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25625634 + 25625635.

It is an arithmetic number, because the mean of its divisors is an integer number (25625635).

Almost surely, 2^51251269 is an apocalyptic number.

It is an amenable number.

51251269 is a deficient number, since it is larger than the sum of its proper divisors (1).

51251269 is an equidigital number, since it uses as much as digits as its factorization.

51251269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 31.

The square root of 51251269 is about 7158.9991618941. Note that the first 3 decimals coincide. The cubic root of 51251269 is about 371.4510078515.

The spelling of 51251269 in words is "fifty-one million, two hundred fifty-one thousand, two hundred sixty-nine".