51248261 has 2 divisors, whose sum is σ = 51248262. Its totient is φ = 51248260.

The previous prime is 51248257. The next prime is 51248269. The reversal of 51248261 is 16284215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45819361 + 5428900 = 6769^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 51248261 - 2² = 51248257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51248269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25624130 + 25624131.

It is an arithmetic number, because the mean of its divisors is an integer number (25624131).

Almost surely, 2^51248261 is an apocalyptic number.

It is an amenable number.

51248261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51248261 is an equidigital number, since it uses as much as digits as its factorization.

51248261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 51248261 is about 7158.7890735794. The cubic root of 51248261 is about 371.4437407372.

The spelling of 51248261 in words is "fifty-one million, two hundred forty-eight thousand, two hundred sixty-one".