135121631 has 2 divisors, whose sum is σ = 135121632. Its totient is φ = 135121630.

The previous prime is 135121603. The next prime is 135121681. The reversal of 135121631 is 136121531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135121631 - 2²² = 130927327 is a prime.

It is a super-2 number, since 2×135121631² = 36515710328200322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 135121597 and 135121606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135121681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67560815 + 67560816.

It is an arithmetic number, because the mean of its divisors is an integer number (67560816).

Almost surely, 2^135121631 is an apocalyptic number.

135121631 is a deficient number, since it is larger than the sum of its proper divisors (1).

135121631 is an equidigital number, since it uses as much as digits as its factorization.

135121631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 135121631 is about 11624.1830250560. The cubic root of 135121631 is about 513.1468015234.

The spelling of 135121631 in words is "one hundred thirty-five million, one hundred twenty-one thousand, six hundred thirty-one".