651551851 has 2 divisors, whose sum is σ = 651551852. Its totient is φ = 651551850.

The previous prime is 651551807. The next prime is 651551881. The reversal of 651551851 is 158155156.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651551851 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 651551851.

It is not a weakly prime, because it can be changed into another prime (651551801) 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, 325775925 + 325775926.

It is an arithmetic number, because the mean of its divisors is an integer number (325775926).

Almost surely, 2^651551851 is an apocalyptic number.

651551851 is a deficient number, since it is larger than the sum of its proper divisors (1).

651551851 is an equidigital number, since it uses as much as digits as its factorization.

651551851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30000, while the sum is 37.

The square root of 651551851 is about 25525.5137264659. The cubic root of 651551851 is about 866.9279287445.

The spelling of 651551851 in words is "six hundred fifty-one million, five hundred fifty-one thousand, eight hundred fifty-one".