840138062149 has 2 divisors, whose sum is σ = 840138062150. Its totient is φ = 840138062148.

The previous prime is 840138062131. The next prime is 840138062173. The reversal of 840138062149 is 941260831048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754761312900 + 85376749249 = 868770^2 + 292193^2 .

It is a cyclic number.

It is not a de Polignac number, because 840138062149 - 2¹⁷ = 840137931077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840138062099 and 840138062108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840138062549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420069031074 + 420069031075.

It is an arithmetic number, because the mean of its divisors is an integer number (420069031075).

Almost surely, 2^840138062149 is an apocalyptic number.

It is an amenable number.

840138062149 is a deficient number, since it is larger than the sum of its proper divisors (1).

840138062149 is an equidigital number, since it uses as much as digits as its factorization.

840138062149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 840138062149 in words is "eight hundred forty billion, one hundred thirty-eight million, sixty-two thousand, one hundred forty-nine".