651901 has 2 divisors, whose sum is σ = 651902. Its totient is φ = 651900.

The previous prime is 651881. The next prime is 651913. The reversal of 651901 is 109156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 89401 = 750^2 + 299^2 .

It is a cyclic number.

It is not a de Polignac number, because 651901 - 2⁵ = 651869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651971) 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, 325950 + 325951.

It is an arithmetic number, because the mean of its divisors is an integer number (325951).

2⁶⁵¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

651901 is a deficient number, since it is larger than the sum of its proper divisors (1).

651901 is an equidigital number, since it uses as much as digits as its factorization.

651901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 651901 is about 807.4038642464. The cubic root of 651901 is about 86.7082755495.

The spelling of 651901 in words is "six hundred fifty-one thousand, nine hundred one".