2154217349 has 2 divisors, whose sum is σ = 2154217350. Its totient is φ = 2154217348.

The previous prime is 2154217343. The next prime is 2154217361. The reversal of 2154217349 is 9437124512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2008653124 + 145564225 = 44818^2 + 12065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154217349 - 2⁴ = 2154217333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154217343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077108674 + 1077108675.

It is an arithmetic number, because the mean of its divisors is an integer number (1077108675).

Almost surely, 2^2154217349 is an apocalyptic number.

It is an amenable number.

2154217349 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154217349 is an equidigital number, since it uses as much as digits as its factorization.

2154217349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 2154217349 is about 46413.5470417851. The cubic root of 2154217349 is about 1291.5062327125.

The spelling of 2154217349 in words is "two billion, one hundred fifty-four million, two hundred seventeen thousand, three hundred forty-nine".