221461553 has 2 divisors, whose sum is σ = 221461554. Its totient is φ = 221461552.

The previous prime is 221461543. The next prime is 221461561. The reversal of 221461553 is 355164122.

221461553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198584464 + 22877089 = 14092^2 + 4783^2 .

It is a cyclic number.

It is not a de Polignac number, because 221461553 - 2⁸ = 221461297 is a prime.

It is not a weakly prime, because it can be changed into another prime (221461543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110730776 + 110730777.

It is an arithmetic number, because the mean of its divisors is an integer number (110730777).

Almost surely, 2^221461553 is an apocalyptic number.

It is an amenable number.

221461553 is a deficient number, since it is larger than the sum of its proper divisors (1).

221461553 is an equidigital number, since it uses as much as digits as its factorization.

221461553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 221461553 is about 14881.5843578565. The cubic root of 221461553 is about 605.0149603568.

The spelling of 221461553 in words is "two hundred twenty-one million, four hundred sixty-one thousand, five hundred fifty-three".