2154727789 has 2 divisors, whose sum is σ = 2154727790. Its totient is φ = 2154727788.

The previous prime is 2154727777. The next prime is 2154727793. The reversal of 2154727789 is 9877274512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1281998025 + 872729764 = 35805^2 + 29542^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154727789 - 2⁹ = 2154727277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154727709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077363894 + 1077363895.

It is an arithmetic number, because the mean of its divisors is an integer number (1077363895).

Almost surely, 2^2154727789 is an apocalyptic number.

It is an amenable number.

2154727789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154727789 is an equidigital number, since it uses as much as digits as its factorization.

2154727789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975680, while the sum is 52.

The square root of 2154727789 is about 46419.0455416739. The cubic root of 2154727789 is about 1291.6082317641.

The spelling of 2154727789 in words is "two billion, one hundred fifty-four million, seven hundred twenty-seven thousand, seven hundred eighty-nine".