651821873 has 2 divisors, whose sum is σ = 651821874. Its totient is φ = 651821872.

The previous prime is 651821867. The next prime is 651821879. The reversal of 651821873 is 378128156.

It is a balanced prime because it is at equal distance from previous prime (651821867) and next prime (651821879).

It can be written as a sum of positive squares in only one way, i.e., 427331584 + 224490289 = 20672^2 + 14983^2 .

It is a cyclic number.

It is not a de Polignac number, because 651821873 - 2⁴ = 651821857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 651821873.

It is not a weakly prime, because it can be changed into another prime (651821879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325910936 + 325910937.

It is an arithmetic number, because the mean of its divisors is an integer number (325910937).

Almost surely, 2^651821873 is an apocalyptic number.

It is an amenable number.

651821873 is a deficient number, since it is larger than the sum of its proper divisors (1).

651821873 is an equidigital number, since it uses as much as digits as its factorization.

651821873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 651821873 is about 25530.8024354896. The cubic root of 651821873 is about 867.0476722371.

The spelling of 651821873 in words is "six hundred fifty-one million, eight hundred twenty-one thousand, eight hundred seventy-three".