135661403 has 8 divisors (see below), whose sum is σ = 137256288. Its totient is φ = 134072064.

The previous prime is 135661367. The next prime is 135661417. The reversal of 135661403 is 304166531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135661403 - 2¹⁴ = 135645019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135661453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66251 + ... + 68267.

It is an arithmetic number, because the mean of its divisors is an integer number (17157036).

Almost surely, 2^135661403 is an apocalyptic number.

135661403 is a deficient number, since it is larger than the sum of its proper divisors (1594885).

135661403 is a wasteful number, since it uses less digits than its factorization.

135661403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 135661403 is about 11647.3775159905. The cubic root of 135661403 is about 513.8291849143.

The spelling of 135661403 in words is "one hundred thirty-five million, six hundred sixty-one thousand, four hundred three".