213436531 has 16 divisors (see below), whose sum is σ = 266999040. Its totient is φ = 165754080.

The previous prime is 213436511. The next prime is 213436543. The reversal of 213436531 is 135634312.

213436531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 213436531 - 2⁹ = 213436019 is a prime.

It is a super-2 number, since 2×213436531² = 91110305530627922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213436531.

It is not an unprimeable number, because it can be changed into a prime (213436511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19125 + ... + 28153.

It is an arithmetic number, because the mean of its divisors is an integer number (16687440).

Almost surely, 2^213436531 is an apocalyptic number.

213436531 is a deficient number, since it is larger than the sum of its proper divisors (53562509).

213436531 is a wasteful number, since it uses less digits than its factorization.

213436531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9354.

The product of its digits is 6480, while the sum is 28.

The square root of 213436531 is about 14609.4671702975. The cubic root of 213436531 is about 597.6169653663.

The spelling of 213436531 in words is "two hundred thirteen million, four hundred thirty-six thousand, five hundred thirty-one".