172223999 has 4 divisors (see below), whose sum is σ = 181288440. Its totient is φ = 163159560.

The previous prime is 172223983. The next prime is 172224001. The reversal of 172223999 is 999322271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172223999 - 2⁴ = 172223983 is a prime.

It is a super-2 number, since 2×172223999² = 59322211663104002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172223939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4532192 + ... + 4532229.

It is an arithmetic number, because the mean of its divisors is an integer number (45322110).

Almost surely, 2^172223999 is an apocalyptic number.

172223999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

172223999 is a deficient number, since it is larger than the sum of its proper divisors (9064441).

172223999 is an equidigital number, since it uses as much as digits as its factorization.

172223999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9064440.

The product of its digits is 122472, while the sum is 44.

The square root of 172223999 is about 13123.4141518128. The cubic root of 172223999 is about 556.3710915265.

The spelling of 172223999 in words is "one hundred seventy-two million, two hundred twenty-three thousand, nine hundred ninety-nine".