213630631 has 8 divisors (see below), whose sum is σ = 217142640. Its totient is φ = 210134592.

The previous prime is 213630583. The next prime is 213630667. The reversal of 213630631 is 136036312.

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

It is a cyclic number.

It is not a de Polignac number, because 213630631 - 2⁷ = 213630503 is a prime.

It is a super-2 number, since 2×213630631² = 91276093002916322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213630596 and 213630605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213630671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24636 + ... + 32158.

It is an arithmetic number, because the mean of its divisors is an integer number (27142830).

Almost surely, 2^213630631 is an apocalyptic number.

213630631 is a deficient number, since it is larger than the sum of its proper divisors (3512009).

213630631 is an equidigital number, since it uses as much as digits as its factorization.

213630631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7985.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 213630631 is about 14616.1086134443. The cubic root of 213630631 is about 597.7980688655.

Adding to 213630631 its reverse (136036312), we get a palindrome (349666943).

The spelling of 213630631 in words is "two hundred thirteen million, six hundred thirty thousand, six hundred thirty-one".