221846725 has 6 divisors (see below), whose sum is σ = 275089970. Its totient is φ = 177477360.

The previous prime is 221846687. The next prime is 221846741. The reversal of 221846725 is 527648122.

It is a happy number.

221846725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 38217124 + 183629601 = 6182^2 + 13551^2 .

It is not a de Polignac number, because 221846725 - 2⁹ = 221846213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4436910 + ... + 4436959.

Almost surely, 2^221846725 is an apocalyptic number.

221846725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221846725 is a deficient number, since it is larger than the sum of its proper divisors (53243245).

221846725 is an equidigital number, since it uses as much as digits as its factorization.

221846725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8873879 (or 8873874 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 221846725 is about 14894.5199654101. The cubic root of 221846725 is about 605.3655100713.

The spelling of 221846725 in words is "two hundred twenty-one million, eight hundred forty-six thousand, seven hundred twenty-five".