51013649 has 2 divisors, whose sum is σ = 51013650. Its totient is φ = 51013648.

The previous prime is 51013603. The next prime is 51013661. The reversal of 51013649 is 94631015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 148225 = 7132^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 51013649 - 2⁸ = 51013393 is a prime.

It is not a weakly prime, because it can be changed into another prime (51012649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25506824 + 25506825.

It is an arithmetic number, because the mean of its divisors is an integer number (25506825).

Almost surely, 2^51013649 is an apocalyptic number.

It is an amenable number.

51013649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51013649 is an equidigital number, since it uses as much as digits as its factorization.

51013649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 51013649 is about 7142.3839857571. The cubic root of 51013649 is about 370.8760565627.

The spelling of 51013649 in words is "fifty-one million, thirteen thousand, six hundred forty-nine".