2138406563 has 2 divisors, whose sum is σ = 2138406564. Its totient is φ = 2138406562.

The previous prime is 2138406551. The next prime is 2138406653. The reversal of 2138406563 is 3656048312.

Together with next prime (2138406653) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138406563 - 2⁶ = 2138406499 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138406763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069203281 + 1069203282.

It is an arithmetic number, because the mean of its divisors is an integer number (1069203282).

Almost surely, 2^2138406563 is an apocalyptic number.

2138406563 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138406563 is an equidigital number, since it uses as much as digits as its factorization.

2138406563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 2138406563 is about 46242.9082454813. The cubic root of 2138406563 is about 1288.3388194296.

The spelling of 2138406563 in words is "two billion, one hundred thirty-eight million, four hundred six thousand, five hundred sixty-three".