13135431 has 4 divisors (see below), whose sum is σ = 17513912. Its totient is φ = 8756952.

The previous prime is 13135399. The next prime is 13135433. The reversal of 13135431 is 13453131.

13135431 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13135431 - 2⁵ = 13135399 is a prime.

It is a super-2 number, since 2×13135431² = 345079095111522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13135398 and 13135407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13135433) 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, 2189236 + ... + 2189241.

It is an arithmetic number, because the mean of its divisors is an integer number (4378478).

Almost surely, 2^13135431 is an apocalyptic number.

13135431 is a deficient number, since it is larger than the sum of its proper divisors (4378481).

13135431 is an equidigital number, since it uses as much as digits as its factorization.

13135431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4378480.

The product of its digits is 540, while the sum is 21.

The square root of 13135431 is about 3624.2835154000. The cubic root of 13135431 is about 235.9471716954.

Adding to 13135431 its reverse (13453131), we get a palindrome (26588562).

The spelling of 13135431 in words is "thirteen million, one hundred thirty-five thousand, four hundred thirty-one".