51249349 has 2 divisors, whose sum is σ = 51249350. Its totient is φ = 51249348.

The previous prime is 51249343. The next prime is 51249361. The reversal of 51249349 is 94394215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 12124324 = 6255^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 51249349 - 2²¹ = 49152197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51249343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25624674 + 25624675.

It is an arithmetic number, because the mean of its divisors is an integer number (25624675).

Almost surely, 2^51249349 is an apocalyptic number.

It is an amenable number.

51249349 is a deficient number, since it is larger than the sum of its proper divisors (1).

51249349 is an equidigital number, since it uses as much as digits as its factorization.

51249349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 51249349 is about 7158.8650636815. The cubic root of 51249349 is about 371.4463693007.

The spelling of 51249349 in words is "fifty-one million, two hundred forty-nine thousand, three hundred forty-nine".