231278212 has 24 divisors (see below), whose sum is σ = 452303712. Its totient is φ = 102561600.

The previous prime is 231278191. The next prime is 231278213. The reversal of 231278212 is 212872132.

It is a super-2 number, since 2×231278212² = 106979222691833888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231278213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62298 + ... + 65905.

It is an arithmetic number, because the mean of its divisors is an integer number (18845988).

Almost surely, 2^231278212 is an apocalyptic number.

231278212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

231278212 is a deficient number, since it is larger than the sum of its proper divisors (221025500).

231278212 is a wasteful number, since it uses less digits than its factorization.

231278212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128259 (or 128257 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 231278212 is about 15207.8339023018. The cubic root of 231278212 is about 613.8254728596.

The spelling of 231278212 in words is "two hundred thirty-one million, two hundred seventy-eight thousand, two hundred twelve".