135604951 has 4 divisors (see below), whose sum is σ = 137903400. Its totient is φ = 133306504.

The previous prime is 135604921. The next prime is 135604981. The reversal of 135604951 is 159406531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159406531 = 1997 ⋅79823.

It is an interprime number because it is at equal distance from previous prime (135604921) and next prime (135604981).

It is a cyclic number.

It is not a de Polignac number, because 135604951 - 2⁹ = 135604439 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 (135604901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1149136 + ... + 1149253.

It is an arithmetic number, because the mean of its divisors is an integer number (34475850).

Almost surely, 2^135604951 is an apocalyptic number.

135604951 is a deficient number, since it is larger than the sum of its proper divisors (2298449).

135604951 is an equidigital number, since it uses as much as digits as its factorization.

135604951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298448.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 135604951 is about 11644.9538856966. The cubic root of 135604951 is about 513.7579027640.

The spelling of 135604951 in words is "one hundred thirty-five million, six hundred four thousand, nine hundred fifty-one".