2151651647 has 2 divisors, whose sum is σ = 2151651648. Its totient is φ = 2151651646.

The previous prime is 2151651643. The next prime is 2151651661. The reversal of 2151651647 is 7461561512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2151651647 - 2² = 2151651643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2151651647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151651643) 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, 1075825823 + 1075825824.

It is an arithmetic number, because the mean of its divisors is an integer number (1075825824).

Almost surely, 2^2151651647 is an apocalyptic number.

2151651647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151651647 is an equidigital number, since it uses as much as digits as its factorization.

2151651647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 38.

The square root of 2151651647 is about 46385.8992259501. The cubic root of 2151651647 is about 1290.9932952228.

The spelling of 2151651647 in words is "two billion, one hundred fifty-one million, six hundred fifty-one thousand, six hundred forty-seven".