212479661 has 4 divisors (see below), whose sum is σ = 212600352. Its totient is φ = 212358972.

The previous prime is 212479639. The next prime is 212479667. The reversal of 212479661 is 166974212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212479661 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 (212479667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57665 + ... + 61238.

It is an arithmetic number, because the mean of its divisors is an integer number (53150088).

Almost surely, 2^212479661 is an apocalyptic number.

It is an amenable number.

212479661 is a deficient number, since it is larger than the sum of its proper divisors (120691).

212479661 is a wasteful number, since it uses less digits than its factorization.

212479661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120690.

The product of its digits is 36288, while the sum is 38.

The square root of 212479661 is about 14576.6820984749. The cubic root of 212479661 is about 596.7225567251.

The spelling of 212479661 in words is "two hundred twelve million, four hundred seventy-nine thousand, six hundred sixty-one".