213137047 has 4 divisors (see below), whose sum is σ = 213184296. Its totient is φ = 213089800.

The previous prime is 213137027. The next prime is 213137051. The reversal of 213137047 is 740731312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213137047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213137017) 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, 16048 + ... + 26149.

It is an arithmetic number, because the mean of its divisors is an integer number (53296074).

Almost surely, 2^213137047 is an apocalyptic number.

213137047 is a deficient number, since it is larger than the sum of its proper divisors (47249).

213137047 is an equidigital number, since it uses as much as digits as its factorization.

213137047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47248.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 213137047 is about 14599.2139171943. The cubic root of 213137047 is about 597.3373186187.

Adding to 213137047 its reverse (740731312), we get a palindrome (953868359).

The spelling of 213137047 in words is "two hundred thirteen million, one hundred thirty-seven thousand, forty-seven".