135631906 has 8 divisors (see below), whose sum is σ = 205734060. Its totient is φ = 67053888.

The previous prime is 135631871. The next prime is 135631907. The reversal of 135631906 is 609136531.

It can be written as a sum of positive squares in 2 ways, for example, as 135512881 + 119025 = 11641^2 + 345^2 .

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

It is not an unprimeable number, because it can be changed into a prime (135631907) 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, 380811 + ... + 381166.

Almost surely, 2^135631906 is an apocalyptic number.

135631906 is a deficient number, since it is larger than the sum of its proper divisors (70102154).

135631906 is an equidigital number, since it uses as much as digits as its factorization.

135631906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762068.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 135631906 is about 11646.1111964466. Note that the first 4 decimals coincide. The cubic root of 135631906 is about 513.7919414101.

The spelling of 135631906 in words is "one hundred thirty-five million, six hundred thirty-one thousand, nine hundred six".