172213966 has 4 divisors (see below), whose sum is σ = 258320952. Its totient is φ = 86106982.

The previous prime is 172213957. The next prime is 172213991. The reversal of 172213966 is 669312271.

172213966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-4 number, since 4×172213966⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43053490 + ... + 43053493.

It is an arithmetic number, because the mean of its divisors is an integer number (64580238).

Almost surely, 2^172213966 is an apocalyptic number.

172213966 is a deficient number, since it is larger than the sum of its proper divisors (86106986).

172213966 is an equidigital number, since it uses as much as digits as its factorization.

172213966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86106985.

The product of its digits is 27216, while the sum is 37.

The square root of 172213966 is about 13123.0318905351. The cubic root of 172213966 is about 556.3602874195.

The spelling of 172213966 in words is "one hundred seventy-two million, two hundred thirteen thousand, nine hundred sixty-six".