51450649 has 2 divisors, whose sum is σ = 51450650. Its totient is φ = 51450648.

The previous prime is 51450601. The next prime is 51450667. The reversal of 51450649 is 94605415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 585225 = 7132^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 51450649 - 2¹¹ = 51448601 is a prime.

It is not a weakly prime, because it can be changed into another prime (51456649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725324 + 25725325.

It is an arithmetic number, because the mean of its divisors is an integer number (25725325).

Almost surely, 2^51450649 is an apocalyptic number.

It is an amenable number.

51450649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51450649 is an equidigital number, since it uses as much as digits as its factorization.

51450649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 51450649 is about 7172.9107759681. The cubic root of 51450649 is about 371.9320630745.

The spelling of 51450649 in words is "fifty-one million, four hundred fifty thousand, six hundred forty-nine".