651601651 has 2 divisors, whose sum is σ = 651601652. Its totient is φ = 651601650.

The previous prime is 651601607. The next prime is 651601697. The reversal of 651601651 is 156106156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651601651 - 2¹⁷ = 651470579 is a prime.

It is not a weakly prime, because it can be changed into another prime (651605651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325800825 + 325800826.

It is an arithmetic number, because the mean of its divisors is an integer number (325800826).

Almost surely, 2^651601651 is an apocalyptic number.

651601651 is a deficient number, since it is larger than the sum of its proper divisors (1).

651601651 is an equidigital number, since it uses as much as digits as its factorization.

651601651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 651601651 is about 25526.4892023952. The cubic root of 651601651 is about 866.9500154548.

The spelling of 651601651 in words is "six hundred fifty-one million, six hundred one thousand, six hundred fifty-one".