212808461 has 4 divisors (see below), whose sum is σ = 212838912. Its totient is φ = 212778012.

The previous prime is 212808451. The next prime is 212808487. The reversal of 212808461 is 164808212.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212808461 - 2¹⁰ = 212807437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212808451) 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, 1076 + ... + 20658.

It is an arithmetic number, because the mean of its divisors is an integer number (53209728).

Almost surely, 2^212808461 is an apocalyptic number.

It is an amenable number.

212808461 is a deficient number, since it is larger than the sum of its proper divisors (30451).

212808461 is a wasteful number, since it uses less digits than its factorization.

212808461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30450.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 212808461 is about 14587.9560254341. The cubic root of 212808461 is about 597.0301959892.

The spelling of 212808461 in words is "two hundred twelve million, eight hundred eight thousand, four hundred sixty-one".