8223217949 has 4 divisors (see below), whose sum is σ = 8255215164. Its totient is φ = 8191220736.

The previous prime is 8223217939. The next prime is 8223217957. The reversal of 8223217949 is 9497123228.

It is a happy number.

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 8152825849 + 70392100 = 90293^2 + 8390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8223217949 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 (8223217939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15998222 + ... + 15998735.

It is an arithmetic number, because the mean of its divisors is an integer number (2063803791).

Almost surely, 2^8223217949 is an apocalyptic number.

It is an amenable number.

8223217949 is a deficient number, since it is larger than the sum of its proper divisors (31997215).

8223217949 is a wasteful number, since it uses less digits than its factorization.

8223217949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31997214.

The product of its digits is 435456, while the sum is 47.

The square root of 8223217949 is about 90681.9604386672. The cubic root of 8223217949 is about 2018.4311208777.

The spelling of 8223217949 in words is "eight billion, two hundred twenty-three million, two hundred seventeen thousand, nine hundred forty-nine".