9705220999 has 4 divisors (see below), whose sum is σ = 9709550136. Its totient is φ = 9700891864.

The previous prime is 9705220991. The next prime is 9705221017. The reversal of 9705220999 is 9990225079.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9990225079 = 67 ⋅149107837.

It is a cyclic number.

It is not a de Polignac number, because 9705220999 - 2³ = 9705220991 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 (9705220991) 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, 2161204 + ... + 2165689.

It is an arithmetic number, because the mean of its divisors is an integer number (2427387534).

Almost surely, 2^9705220999 is an apocalyptic number.

9705220999 is a deficient number, since it is larger than the sum of its proper divisors (4329137).

9705220999 is a wasteful number, since it uses less digits than its factorization.

9705220999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4329136.

The product of its (nonzero) digits is 918540, while the sum is 52.

The square root of 9705220999 is about 98515.0800588418. The cubic root of 9705220999 is about 2133.0538017344.

The spelling of 9705220999 in words is "nine billion, seven hundred five million, two hundred twenty thousand, nine hundred ninety-nine".