135631157 has 4 divisors (see below), whose sum is σ = 138939276. Its totient is φ = 132323040.

The previous prime is 135631141. The next prime is 135631163. The reversal of 135631157 is 751136531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751136531 = 67 ⋅11210993.

It can be written as a sum of positive squares in 2 ways, for example, as 8708401 + 126922756 = 2951^2 + 11266^2 .

It is a cyclic number.

It is not a de Polignac number, because 135631157 - 2⁴ = 135631141 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 (135631127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1653998 + ... + 1654079.

It is an arithmetic number, because the mean of its divisors is an integer number (34734819).

Almost surely, 2^135631157 is an apocalyptic number.

It is an amenable number.

135631157 is a deficient number, since it is larger than the sum of its proper divisors (3308119).

135631157 is an equidigital number, since it uses as much as digits as its factorization.

135631157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308118.

The product of its digits is 9450, while the sum is 32.

The square root of 135631157 is about 11646.0790397455. The cubic root of 135631157 is about 513.7909956373.

Adding to 135631157 its reverse (751136531), we get a palindrome (886767688).

The spelling of 135631157 in words is "one hundred thirty-five million, six hundred thirty-one thousand, one hundred fifty-seven".