213542709 has 4 divisors (see below), whose sum is σ = 284723616. Its totient is φ = 142361804.

The previous prime is 213542701. The next prime is 213542711. The reversal of 213542709 is 907245312.

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 213542709 - 2³ = 213542701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213542709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213542701) 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, 35590449 + ... + 35590454.

It is an arithmetic number, because the mean of its divisors is an integer number (71180904).

Almost surely, 2^213542709 is an apocalyptic number.

It is an amenable number.

213542709 is a deficient number, since it is larger than the sum of its proper divisors (71180907).

213542709 is an equidigital number, since it uses as much as digits as its factorization.

213542709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71180906.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 213542709 is about 14613.1005950141. The cubic root of 213542709 is about 597.7160475223.

It can be divided in two parts, 2135 and 42709, that added together give a palindrome (44844).

The spelling of 213542709 in words is "two hundred thirteen million, five hundred forty-two thousand, seven hundred nine".