213631397 has 8 divisors (see below), whose sum is σ = 244600896. Its totient is φ = 182774592.

The previous prime is 213631391. The next prime is 213631423. The reversal of 213631397 is 793136312.

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

It is not a de Polignac number, because 213631397 - 2⁸ = 213631141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213631391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24068 + ... + 31725.

It is an arithmetic number, because the mean of its divisors is an integer number (30575112).

Almost surely, 2^213631397 is an apocalyptic number.

It is an amenable number.

213631397 is a deficient number, since it is larger than the sum of its proper divisors (30969499).

213631397 is an equidigital number, since it uses as much as digits as its factorization.

213631397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56347.

The product of its digits is 20412, while the sum is 35.

The square root of 213631397 is about 14616.1348173859. The cubic root of 213631397 is about 597.7987833585.

It can be divided in two parts, 2136 and 31397, that added together give a palindrome (33533).

The spelling of 213631397 in words is "two hundred thirteen million, six hundred thirty-one thousand, three hundred ninety-seven".