212961287 has 8 divisors (see below), whose sum is σ = 265510272. Its totient is φ = 165943800.

The previous prime is 212961283. The next prime is 212961299. The reversal of 212961287 is 782169212.

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

It is not a de Polignac number, because 212961287 - 2² = 212961283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212961287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212961283) 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, 1382789 + ... + 1382942.

It is an arithmetic number, because the mean of its divisors is an integer number (33188784).

Almost surely, 2^212961287 is an apocalyptic number.

212961287 is a deficient number, since it is larger than the sum of its proper divisors (52548985).

212961287 is a wasteful number, since it uses less digits than its factorization.

212961287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765749.

The product of its digits is 24192, while the sum is 38.

The square root of 212961287 is about 14593.1931735313. The cubic root of 212961287 is about 597.1730786290.

The spelling of 212961287 in words is "two hundred twelve million, nine hundred sixty-one thousand, two hundred eighty-seven".