213636973 has 4 divisors (see below), whose sum is σ = 233058528. Its totient is φ = 194215420.

The previous prime is 213636961. The next prime is 213636979. The reversal of 213636973 is 379636312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213636973 - 2²¹ = 211539821 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 (213636979) 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 3 ways as a sum of consecutive naturals, for example, 9710761 + ... + 9710782.

It is an arithmetic number, because the mean of its divisors is an integer number (58264632).

Almost surely, 2^213636973 is an apocalyptic number.

It is an amenable number.

213636973 is a deficient number, since it is larger than the sum of its proper divisors (19421555).

213636973 is a wasteful number, since it uses less digits than its factorization.

213636973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19421554.

The product of its digits is 122472, while the sum is 40.

The square root of 213636973 is about 14616.3255642449. The cubic root of 213636973 is about 597.8039843684.

The spelling of 213636973 in words is "two hundred thirteen million, six hundred thirty-six thousand, nine hundred seventy-three".