54781669 has 2 divisors, whose sum is σ = 54781670. Its totient is φ = 54781668.

The previous prime is 54781621. The next prime is 54781687. The reversal of 54781669 is 96618745.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 5008644 = 7055^2 + 2238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54781669 is a prime.

It is a super-2 number, since 2×54781669² = 6002062516851122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54782669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27390834 + 27390835.

It is an arithmetic number, because the mean of its divisors is an integer number (27390835).

Almost surely, 2^54781669 is an apocalyptic number.

It is an amenable number.

54781669 is a deficient number, since it is larger than the sum of its proper divisors (1).

54781669 is an equidigital number, since it uses as much as digits as its factorization.

54781669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 54781669 is about 7401.4639768089. The cubic root of 54781669 is about 379.7913651583.

The spelling of 54781669 in words is "fifty-four million, seven hundred eighty-one thousand, six hundred sixty-nine".