135628231 has 2 divisors, whose sum is σ = 135628232. Its totient is φ = 135628230.

The previous prime is 135628223. The next prime is 135628249. The reversal of 135628231 is 132826531.

It is a weak prime.

It is an emirp because it is prime and its reverse (132826531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135628231 - 2³ = 135628223 is a prime.

It is a super-2 number, since 2×135628231² = 36790034088378722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 135628193 and 135628202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135628201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67814115 + 67814116.

It is an arithmetic number, because the mean of its divisors is an integer number (67814116).

Almost surely, 2^135628231 is an apocalyptic number.

135628231 is a deficient number, since it is larger than the sum of its proper divisors (1).

135628231 is an equidigital number, since it uses as much as digits as its factorization.

135628231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 135628231 is about 11645.9534173892. The cubic root of 135628231 is about 513.7873009030.

The spelling of 135628231 in words is "one hundred thirty-five million, six hundred twenty-eight thousand, two hundred thirty-one".