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99447221 = 103965507
BaseRepresentation
bin1011110110101…
…11000110110101
320221010102221102
411323113012311
5200424302341
613511255445
72315200406
oct573270665
9227112842
1099447221
1151154195
122937a585
13177ac013
14d2c99ad
158ae5c9b
hex5ed71b5

99447221 has 4 divisors (see below), whose sum is σ = 100412832. Its totient is φ = 98481612.

The previous prime is 99447211. The next prime is 99447233. The reversal of 99447221 is 12274499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12274499 = 40930011.

It is a cyclic number.

It is not a de Polignac number, because 99447221 - 222 = 95252917 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 (99447211) 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, 482651 + ... + 482856.

It is an arithmetic number, because the mean of its divisors is an integer number (25103208).

Almost surely, 299447221 is an apocalyptic number.

It is an amenable number.

99447221 is a deficient number, since it is larger than the sum of its proper divisors (965611).

99447221 is a wasteful number, since it uses less digits than its factorization.

99447221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965610.

The product of its digits is 36288, while the sum is 38.

The square root of 99447221 is about 9972.3227484874. The cubic root of 99447221 is about 463.3020449977.

The spelling of 99447221 in words is "ninety-nine million, four hundred forty-seven thousand, two hundred twenty-one".

Divisors: 1 103 965507 99447221