212892991 has 4 divisors (see below), whose sum is σ = 222149232. Its totient is φ = 203636752.

The previous prime is 212892983. The next prime is 212893001. The reversal of 212892991 is 199298212.

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 212892991 - 2³ = 212892983 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 (212892941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4628086 + ... + 4628131.

It is an arithmetic number, because the mean of its divisors is an integer number (55537308).

Almost surely, 2^212892991 is an apocalyptic number.

212892991 is a deficient number, since it is larger than the sum of its proper divisors (9256241).

212892991 is an equidigital number, since it uses as much as digits as its factorization.

212892991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9256240.

The product of its digits is 46656, while the sum is 43.

The square root of 212892991 is about 14590.8529908296. The cubic root of 212892991 is about 597.1092346416.

The spelling of 212892991 in words is "two hundred twelve million, eight hundred ninety-two thousand, nine hundred ninety-one".