212661231 has 8 divisors (see below), whose sum is σ = 283901184. Its totient is φ = 141597720.

The previous prime is 212661227. The next prime is 212661331. The reversal of 212661231 is 132166212.

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

It is not a de Polignac number, because 212661231 - 2² = 212661227 is a prime.

It is a super-2 number, since 2×212661231² = 90449598340870722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212661221) 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 7 ways as a sum of consecutive naturals, for example, 41271 + ... + 46136.

It is an arithmetic number, because the mean of its divisors is an integer number (35487648).

Almost surely, 2^212661231 is an apocalyptic number.

212661231 is a deficient number, since it is larger than the sum of its proper divisors (71239953).

212661231 is an equidigital number, since it uses as much as digits as its factorization.

212661231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88221.

The product of its digits is 864, while the sum is 24.

The square root of 212661231 is about 14582.9088662036. The cubic root of 212661231 is about 596.8924805458.

The spelling of 212661231 in words is "two hundred twelve million, six hundred sixty-one thousand, two hundred thirty-one".