2154810649 has 2 divisors, whose sum is σ = 2154810650. Its totient is φ = 2154810648.

The previous prime is 2154810629. The next prime is 2154810667. The reversal of 2154810649 is 9460184512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2076169225 + 78641424 = 45565^2 + 8868^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154810649 - 2⁵ = 2154810617 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154810629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077405324 + 1077405325.

It is an arithmetic number, because the mean of its divisors is an integer number (1077405325).

Almost surely, 2^2154810649 is an apocalyptic number.

It is an amenable number.

2154810649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154810649 is an equidigital number, since it uses as much as digits as its factorization.

2154810649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 2154810649 is about 46419.9380546765. The cubic root of 2154810649 is about 1291.6247878053.

The spelling of 2154810649 in words is "two billion, one hundred fifty-four million, eight hundred ten thousand, six hundred forty-nine".