13135781 has 8 divisors (see below), whose sum is σ = 14105664. Its totient is φ = 12187840.

The previous prime is 13135739. The next prime is 13135789. The reversal of 13135781 is 18753131.

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 13135781 - 2²² = 8941477 is a prime.

It is a super-2 number, since 2×13135781² = 345097484959922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13135789) 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 7 ways as a sum of consecutive naturals, for example, 4235 + ... + 6648.

It is an arithmetic number, because the mean of its divisors is an integer number (1763208).

Almost surely, 2^13135781 is an apocalyptic number.

It is an amenable number.

13135781 is a deficient number, since it is larger than the sum of its proper divisors (969883).

13135781 is a wasteful number, since it uses less digits than its factorization.

13135781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10971.

The product of its digits is 2520, while the sum is 29.

The square root of 13135781 is about 3624.3318004841. The cubic root of 13135781 is about 235.9492673195.

The spelling of 13135781 in words is "thirteen million, one hundred thirty-five thousand, seven hundred eighty-one".