221501461 has 2 divisors, whose sum is σ = 221501462. Its totient is φ = 221501460.

The previous prime is 221501453. The next prime is 221501473. The reversal of 221501461 is 164105122.

221501461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138509361 + 82992100 = 11769^2 + 9110^2 .

It is a cyclic number.

It is not a de Polignac number, because 221501461 - 2³ = 221501453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221508461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110750730 + 110750731.

It is an arithmetic number, because the mean of its divisors is an integer number (110750731).

Almost surely, 2^221501461 is an apocalyptic number.

It is an amenable number.

221501461 is a deficient number, since it is larger than the sum of its proper divisors (1).

221501461 is an equidigital number, since it uses as much as digits as its factorization.

221501461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 221501461 is about 14882.9251493112. The cubic root of 221501461 is about 605.0512999780.

Adding to 221501461 its reverse (164105122), we get a palindrome (385606583).

The spelling of 221501461 in words is "two hundred twenty-one million, five hundred one thousand, four hundred sixty-one".