55521649 has 2 divisors, whose sum is σ = 55521650. Its totient is φ = 55521648.

The previous prime is 55521611. The next prime is 55521659. The reversal of 55521649 is 94612555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 5607424 = 7065^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 55521649 - 2¹³ = 55513457 is a prime.

It is not a weakly prime, because it can be changed into another prime (55521659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27760824 + 27760825.

It is an arithmetic number, because the mean of its divisors is an integer number (27760825).

Almost surely, 2^55521649 is an apocalyptic number.

It is an amenable number.

55521649 is a deficient number, since it is larger than the sum of its proper divisors (1).

55521649 is an equidigital number, since it uses as much as digits as its factorization.

55521649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 37.

The square root of 55521649 is about 7451.2850569549. The cubic root of 55521649 is about 381.4937717527.

The spelling of 55521649 in words is "fifty-five million, five hundred twenty-one thousand, six hundred forty-nine".