213630461 has 6 divisors (see below), whose sum is σ = 234817086. Its totient is φ = 194209400.

The previous prime is 213630427. The next prime is 213630467. The reversal of 213630461 is 164036312.

It can be written as a sum of positive squares in only one way, i.e., 109202500 + 104427961 = 10450^2 + 10219^2 .

It is not a de Polignac number, because 213630461 - 2¹⁴ = 213614077 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 213630461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213630467) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 882650 + ... + 882891.

It is an arithmetic number, because the mean of its divisors is an integer number (39136181).

Almost surely, 2^213630461 is an apocalyptic number.

It is an amenable number.

213630461 is a deficient number, since it is larger than the sum of its proper divisors (21186625).

213630461 is a wasteful number, since it uses less digits than its factorization.

213630461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765563 (or 1765552 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 213630461 is about 14616.1027979417. The cubic root of 213630461 is about 597.7979102964.

Adding to 213630461 its reverse (164036312), we get a palindrome (377666773).

The spelling of 213630461 in words is "two hundred thirteen million, six hundred thirty thousand, four hundred sixty-one".