135287631 has 16 divisors (see below), whose sum is σ = 201160800. Its totient is φ = 89861184.

The previous prime is 135287629. The next prime is 135287671. The reversal of 135287631 is 136782531.

135287631 is a `hidden beast` number, since 13 + 5 + 2 + 8 + 7 + 631 = 666.

It is not a de Polignac number, because 135287631 - 2¹ = 135287629 is a prime.

It is a super-2 number, since 2×135287631² = 36605486203184322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135287671) 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 15 ways as a sum of consecutive naturals, for example, 1566 + ... + 16523.

It is an arithmetic number, because the mean of its divisors is an integer number (12572550).

Almost surely, 2^135287631 is an apocalyptic number.

135287631 is a deficient number, since it is larger than the sum of its proper divisors (65873169).

135287631 is a wasteful number, since it uses less digits than its factorization.

135287631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18375 (or 18369 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 135287631 is about 11631.3211201480. The cubic root of 135287631 is about 513.3568530387.

The spelling of 135287631 in words is "one hundred thirty-five million, two hundred eighty-seven thousand, six hundred thirty-one".