135537213 has 16 divisors (see below), whose sum is σ = 213655680. Its totient is φ = 74778816.

The previous prime is 135537191. The next prime is 135537217. The reversal of 135537213 is 312735531.

It is not a de Polignac number, because 135537213 - 2¹² = 135533117 is a prime.

It is a super-2 number, since 2×135537213² = 36740672215614738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135537217) 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, 110670 + ... + 111887.

It is an arithmetic number, because the mean of its divisors is an integer number (13353480).

Almost surely, 2^135537213 is an apocalyptic number.

It is an amenable number.

135537213 is a deficient number, since it is larger than the sum of its proper divisors (78118467).

135537213 is a wasteful number, since it uses less digits than its factorization.

135537213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222596.

The product of its digits is 9450, while the sum is 30.

The square root of 135537213 is about 11642.0450523093. The cubic root of 135537213 is about 513.6723436237.

The spelling of 135537213 in words is "one hundred thirty-five million, five hundred thirty-seven thousand, two hundred thirteen".