651068449 has 2 divisors, whose sum is σ = 651068450. Its totient is φ = 651068448.

The previous prime is 651068447. The next prime is 651068477. The reversal of 651068449 is 944860156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622253025 + 28815424 = 24945^2 + 5368^2 .

It is a cyclic number.

It is not a de Polignac number, because 651068449 - 2¹ = 651068447 is a prime.

Together with 651068447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (651068441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325534224 + 325534225.

It is an arithmetic number, because the mean of its divisors is an integer number (325534225).

Almost surely, 2^651068449 is an apocalyptic number.

It is an amenable number.

651068449 is a deficient number, since it is larger than the sum of its proper divisors (1).

651068449 is an equidigital number, since it uses as much as digits as its factorization.

651068449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 651068449 is about 25516.0429730003. The cubic root of 651068449 is about 866.7134774683.

The spelling of 651068449 in words is "six hundred fifty-one million, sixty-eight thousand, four hundred forty-nine".