213689525437 has 4 divisors (see below), whose sum is σ = 214924725180. Its totient is φ = 212454325696.

The previous prime is 213689525351. The next prime is 213689525449. The reversal of 213689525437 is 734525986312.

213689525437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 171678464281 + 42011061156 = 414341^2 + 204966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213689525437 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 (213689525477) 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, 617599612 + ... + 617599957.

It is an arithmetic number, because the mean of its divisors is an integer number (53731181295).

Almost surely, 2^213689525437 is an apocalyptic number.

It is an amenable number.

213689525437 is a deficient number, since it is larger than the sum of its proper divisors (1235199743).

213689525437 is a wasteful number, since it uses less digits than its factorization.

213689525437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235199742.

The product of its digits is 10886400, while the sum is 55.

The spelling of 213689525437 in words is "two hundred thirteen billion, six hundred eighty-nine million, five hundred twenty-five thousand, four hundred thirty-seven".