651510161 has 2 divisors, whose sum is σ = 651510162. Its totient is φ = 651510160.

The previous prime is 651510149. The next prime is 651510179. The reversal of 651510161 is 161015156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637259536 + 14250625 = 25244^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 651510161 - 2²² = 647315857 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 651510161.

It is not a weakly prime, because it can be changed into another prime (651510961) 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, 325755080 + 325755081.

It is an arithmetic number, because the mean of its divisors is an integer number (325755081).

Almost surely, 2^651510161 is an apocalyptic number.

It is an amenable number.

651510161 is a deficient number, since it is larger than the sum of its proper divisors (1).

651510161 is an equidigital number, since it uses as much as digits as its factorization.

651510161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 651510161 is about 25524.6970794954. The cubic root of 651510161 is about 866.9094380206.

The spelling of 651510161 in words is "six hundred fifty-one million, five hundred ten thousand, one hundred sixty-one".