2138965471 has 2 divisors, whose sum is σ = 2138965472. Its totient is φ = 2138965470.

The previous prime is 2138965463. The next prime is 2138965501. The reversal of 2138965471 is 1745698312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138965471 - 2³ = 2138965463 is a prime.

It is a super-3 number, since 3×2138965471³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138965271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069482735 + 1069482736.

It is an arithmetic number, because the mean of its divisors is an integer number (1069482736).

Almost surely, 2^2138965471 is an apocalyptic number.

2138965471 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138965471 is an equidigital number, since it uses as much as digits as its factorization.

2138965471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 2138965471 is about 46248.9510259422. The cubic root of 2138965471 is about 1288.4510525538.

The spelling of 2138965471 in words is "two billion, one hundred thirty-eight million, nine hundred sixty-five thousand, four hundred seventy-one".