221951461 has 4 divisors (see below), whose sum is σ = 222007500. Its totient is φ = 221895424.

The previous prime is 221951459. The next prime is 221951479. The reversal of 221951461 is 164159122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186322500 + 35628961 = 13650^2 + 5969^2 .

It is a cyclic number.

It is not a de Polignac number, because 221951461 - 2¹ = 221951459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221951441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21586 + ... + 30163.

It is an arithmetic number, because the mean of its divisors is an integer number (55501875).

Almost surely, 2^221951461 is an apocalyptic number.

It is an amenable number.

221951461 is a deficient number, since it is larger than the sum of its proper divisors (56039).

221951461 is an equidigital number, since it uses as much as digits as its factorization.

221951461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56038.

The product of its digits is 4320, while the sum is 31.

The square root of 221951461 is about 14898.0354745181. The cubic root of 221951461 is about 605.4607614013.

The spelling of 221951461 in words is "two hundred twenty-one million, nine hundred fifty-one thousand, four hundred sixty-one".