651198641 has 2 divisors, whose sum is σ = 651198642. Its totient is φ = 651198640.

The previous prime is 651198623. The next prime is 651198649. The reversal of 651198641 is 146891156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543869041 + 107329600 = 23321^2 + 10360^2 .

It is a cyclic number.

It is not a de Polignac number, because 651198641 - 2¹⁸ = 650936497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (651198649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325599320 + 325599321.

It is an arithmetic number, because the mean of its divisors is an integer number (325599321).

Almost surely, 2^651198641 is an apocalyptic number.

It is an amenable number.

651198641 is a deficient number, since it is larger than the sum of its proper divisors (1).

651198641 is an equidigital number, since it uses as much as digits as its factorization.

651198641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 651198641 is about 25518.5940247499. The cubic root of 651198641 is about 866.7712448918.

The spelling of 651198641 in words is "six hundred fifty-one million, one hundred ninety-eight thousand, six hundred forty-one".