212192945 has 8 divisors (see below), whose sum is σ = 254852136. Its totient is φ = 169607296.

The previous prime is 212192909. The next prime is 212192947. The reversal of 212192945 is 549291212.

It can be written as a sum of positive squares in 4 ways, for example, as 4343056 + 207849889 = 2084^2 + 14417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212192945 - 2¹⁴ = 212176561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212192947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11822 + ... + 23751.

It is an arithmetic number, because the mean of its divisors is an integer number (31856517).

Almost surely, 2^212192945 is an apocalyptic number.

It is an amenable number.

212192945 is a deficient number, since it is larger than the sum of its proper divisors (42659191).

212192945 is a wasteful number, since it uses less digits than its factorization.

212192945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36771.

The product of its digits is 12960, while the sum is 35.

The square root of 212192945 is about 14566.8440301940. The cubic root of 212192945 is about 596.4540338986.

The spelling of 212192945 in words is "two hundred twelve million, one hundred ninety-two thousand, nine hundred forty-five".