135533437 has 6 divisors (see below), whose sum is σ = 146761242. Its totient is φ = 125107632.

The previous prime is 135533417. The next prime is 135533491. The reversal of 135533437 is 734335531.

It can be written as a sum of positive squares in 3 ways, for example, as 15280281 + 120253156 = 3909^2 + 10966^2 .

It is not a de Polignac number, because 135533437 - 2⁷ = 135533309 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 (135533407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400818 + ... + 401155.

It is an arithmetic number, because the mean of its divisors is an integer number (24460207).

Almost surely, 2^135533437 is an apocalyptic number.

It is an amenable number.

135533437 is a deficient number, since it is larger than the sum of its proper divisors (11227805).

135533437 is an equidigital number, since it uses as much as digits as its factorization.

135533437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801999 (or 801986 counting only the distinct ones).

The product of its digits is 56700, while the sum is 34.

The square root of 135533437 is about 11641.8828803592. The cubic root of 135533437 is about 513.6675733599.

Adding to 135533437 its reverse (734335531), we get a palindrome (869868968).

The spelling of 135533437 in words is "one hundred thirty-five million, five hundred thirty-three thousand, four hundred thirty-seven".