54981551509 has 2 divisors, whose sum is σ = 54981551510. Its totient is φ = 54981551508.

The previous prime is 54981551503. The next prime is 54981551531. The reversal of 54981551509 is 90515518945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54969147025 + 12404484 = 234455^2 + 3522^2 .

It is a cyclic number.

It is not a de Polignac number, because 54981551509 - 2⁷ = 54981551381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54981551503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27490775754 + 27490775755.

It is an arithmetic number, because the mean of its divisors is an integer number (27490775755).

Almost surely, 2^54981551509 is an apocalyptic number.

It is an amenable number.

54981551509 is a deficient number, since it is larger than the sum of its proper divisors (1).

54981551509 is an equidigital number, since it uses as much as digits as its factorization.

54981551509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620000, while the sum is 52.

The spelling of 54981551509 in words is "fifty-four billion, nine hundred eighty-one million, five hundred fifty-one thousand, five hundred nine".