2154923489 has 2 divisors, whose sum is σ = 2154923490. Its totient is φ = 2154923488.

The previous prime is 2154923483. The next prime is 2154923591. The reversal of 2154923489 is 9843294512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2153702464 + 1221025 = 46408^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154923489 - 2⁴ = 2154923473 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154923483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077461744 + 1077461745.

It is an arithmetic number, because the mean of its divisors is an integer number (1077461745).

Almost surely, 2^2154923489 is an apocalyptic number.

It is an amenable number.

2154923489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154923489 is an equidigital number, since it uses as much as digits as its factorization.

2154923489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 2154923489 is about 46421.1534647729. The cubic root of 2154923489 is about 1291.6473333899.

The spelling of 2154923489 in words is "two billion, one hundred fifty-four million, nine hundred twenty-three thousand, four hundred eighty-nine".