2154405551209 has 2 divisors, whose sum is σ = 2154405551210. Its totient is φ = 2154405551208.

The previous prime is 2154405551173. The next prime is 2154405551261. The reversal of 2154405551209 is 9021555044512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2083989621609 + 70415929600 = 1443603^2 + 265360^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154405551209 - 2⁹ = 2154405550697 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154405551009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077202775604 + 1077202775605.

It is an arithmetic number, because the mean of its divisors is an integer number (1077202775605).

Almost surely, 2^{2154405551209} is an apocalyptic number.

It is an amenable number.

2154405551209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154405551209 is an equidigital number, since it uses as much as digits as its factorization.

2154405551209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 2154405551209 in words is "two trillion, one hundred fifty-four billion, four hundred five million, five hundred fifty-one thousand, two hundred nine".