647162123 has 2 divisors, whose sum is σ = 647162124. Its totient is φ = 647162122.

The previous prime is 647162119. The next prime is 647162167. The reversal of 647162123 is 321261746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647162123 - 2² = 647162119 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647162123.

It is not a weakly prime, because it can be changed into another prime (647162183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323581061 + 323581062.

It is an arithmetic number, because the mean of its divisors is an integer number (323581062).

Almost surely, 2^647162123 is an apocalyptic number.

647162123 is a deficient number, since it is larger than the sum of its proper divisors (1).

647162123 is an equidigital number, since it uses as much as digits as its factorization.

647162123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 647162123 is about 25439.3813407480. The cubic root of 647162123 is about 864.9766097900.

The spelling of 647162123 in words is "six hundred forty-seven million, one hundred sixty-two thousand, one hundred twenty-three".