55530649 has 2 divisors, whose sum is σ = 55530650. Its totient is φ = 55530648.

The previous prime is 55530613. The next prime is 55530659. The reversal of 55530649 is 94603555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54287424 + 1243225 = 7368^2 + 1115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55530649 is a prime.

It is a super-2 number, since 2×55530649² = 6167305956722402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55530659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765324 + 27765325.

It is an arithmetic number, because the mean of its divisors is an integer number (27765325).

Almost surely, 2^55530649 is an apocalyptic number.

It is an amenable number.

55530649 is a deficient number, since it is larger than the sum of its proper divisors (1).

55530649 is an equidigital number, since it uses as much as digits as its factorization.

55530649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 55530649 is about 7451.8889551576. Note that the first 3 decimals coincide. The cubic root of 55530649 is about 381.5143838833.

The spelling of 55530649 in words is "fifty-five million, five hundred thirty thousand, six hundred forty-nine".