135431447 has 4 divisors (see below), whose sum is σ = 136328496. Its totient is φ = 134534400.

The previous prime is 135431431. The next prime is 135431473. The reversal of 135431447 is 744134531.

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

It is a cyclic number.

It is not a de Polignac number, because 135431447 - 2⁴ = 135431431 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 (135430447) 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, 448298 + ... + 448599.

It is an arithmetic number, because the mean of its divisors is an integer number (34082124).

Almost surely, 2^135431447 is an apocalyptic number.

135431447 is a deficient number, since it is larger than the sum of its proper divisors (897049).

135431447 is an equidigital number, since it uses as much as digits as its factorization.

135431447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897048.

The product of its digits is 20160, while the sum is 32.

The square root of 135431447 is about 11637.5017508055. The cubic root of 135431447 is about 513.5386947022.

Adding to 135431447 its reverse (744134531), we get a palindrome (879565978).

The spelling of 135431447 in words is "one hundred thirty-five million, four hundred thirty-one thousand, four hundred forty-seven".