651780001 has 2 divisors, whose sum is σ = 651780002. Its totient is φ = 651780000.

The previous prime is 651779969. The next prime is 651780037. The reversal of 651780001 is 100087156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508953600 + 142826401 = 22560^2 + 11951^2 .

It is a cyclic number.

It is not a de Polignac number, because 651780001 - 2⁵ = 651779969 is a prime.

It is not a weakly prime, because it can be changed into another prime (651780401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325890000 + 325890001.

It is an arithmetic number, because the mean of its divisors is an integer number (325890001).

Almost surely, 2^651780001 is an apocalyptic number.

It is an amenable number.

651780001 is a deficient number, since it is larger than the sum of its proper divisors (1).

651780001 is an equidigital number, since it uses as much as digits as its factorization.

651780001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 651780001 is about 25529.9823932568. The cubic root of 651780001 is about 867.0291059186.

The spelling of 651780001 in words is "six hundred fifty-one million, seven hundred eighty thousand, one".