651609403 has 2 divisors, whose sum is σ = 651609404. Its totient is φ = 651609402.

The previous prime is 651609397. The next prime is 651609421. The reversal of 651609403 is 304906156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651609403 - 2⁹ = 651608891 is a prime.

It is not a weakly prime, because it can be changed into another prime (651609463) 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, 325804701 + 325804702.

It is an arithmetic number, because the mean of its divisors is an integer number (325804702).

Almost surely, 2^651609403 is an apocalyptic number.

651609403 is a deficient number, since it is larger than the sum of its proper divisors (1).

651609403 is an equidigital number, since it uses as much as digits as its factorization.

651609403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 651609403 is about 25526.6410442110. The cubic root of 651609403 is about 866.9534534295.

The spelling of 651609403 in words is "six hundred fifty-one million, six hundred nine thousand, four hundred three".