135537861 has 4 divisors (see below), whose sum is σ = 180717152. Its totient is φ = 90358572.

The previous prime is 135537847. The next prime is 135537893. The reversal of 135537861 is 168735531.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 168735531 = 3 ⋅56245177.

It is not a de Polignac number, because 135537861 - 2¹⁸ = 135275717 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 (135537461) 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, 22589641 + ... + 22589646.

It is an arithmetic number, because the mean of its divisors is an integer number (45179288).

Almost surely, 2^135537861 is an apocalyptic number.

It is an amenable number.

135537861 is a deficient number, since it is larger than the sum of its proper divisors (45179291).

135537861 is an equidigital number, since it uses as much as digits as its factorization.

135537861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45179290.

The product of its digits is 75600, while the sum is 39.

The square root of 135537861 is about 11642.0728824381. The cubic root of 135537861 is about 513.6731622406.

The spelling of 135537861 in words is "one hundred thirty-five million, five hundred thirty-seven thousand, eight hundred sixty-one".