213989631 has 8 divisors (see below), whose sum is σ = 297724800. Its totient is φ = 136457112.

The previous prime is 213989623. The next prime is 213989651. The reversal of 213989631 is 136989312.

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

It is not a de Polignac number, because 213989631 - 2³ = 213989623 is a prime.

It is a super-2 number, since 2×213989631² = 91583124351032322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213989651) 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, 1550581 + ... + 1550718.

It is an arithmetic number, because the mean of its divisors is an integer number (37215600).

Almost surely, 2^213989631 is an apocalyptic number.

213989631 is a deficient number, since it is larger than the sum of its proper divisors (83735169).

213989631 is a wasteful number, since it uses less digits than its factorization.

213989631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101325.

The product of its digits is 69984, while the sum is 42.

The square root of 213989631 is about 14628.3844289108. The cubic root of 213989631 is about 598.1327421641.

The spelling of 213989631 in words is "two hundred thirteen million, nine hundred eighty-nine thousand, six hundred thirty-one".