221625297 has 6 divisors (see below), whose sum is σ = 320125442. Its totient is φ = 147750192.

The previous prime is 221625251. The next prime is 221625307. The reversal of 221625297 is 792526122.

It is a happy number.

221625297 is a `hidden beast` number, since 2 + 2 + 1 + 625 + 29 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 201185856 + 20439441 = 14184^2 + 4521^2 .

It is not a de Polignac number, because 221625297 - 2⁶ = 221625233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221625797) 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 5 ways as a sum of consecutive naturals, for example, 12312508 + ... + 12312525.

Almost surely, 2^221625297 is an apocalyptic number.

It is an amenable number.

221625297 is a deficient number, since it is larger than the sum of its proper divisors (98500145).

221625297 is a wasteful number, since it uses less digits than its factorization.

221625297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24625039 (or 24625036 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 221625297 is about 14887.0849060520. The cubic root of 221625297 is about 605.1640353876.

The spelling of 221625297 in words is "two hundred twenty-one million, six hundred twenty-five thousand, two hundred ninety-seven".