213660461 has 4 divisors (see below), whose sum is σ = 244183392. Its totient is φ = 183137532.

The previous prime is 213660451. The next prime is 213660481. The reversal of 213660461 is 164066312.

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.

It is a cyclic number.

It is not a de Polignac number, because 213660461 - 2⁶ = 213660397 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 (213660451) 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, 15261455 + ... + 15261468.

It is an arithmetic number, because the mean of its divisors is an integer number (61045848).

Almost surely, 2^213660461 is an apocalyptic number.

It is an amenable number.

213660461 is a deficient number, since it is larger than the sum of its proper divisors (30522931).

213660461 is an equidigital number, since it uses as much as digits as its factorization.

213660461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30522930.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 213660461 is about 14617.1290272748. The cubic root of 213660461 is about 597.8258917896.

The spelling of 213660461 in words is "two hundred thirteen million, six hundred sixty thousand, four hundred sixty-one".