135247531 has 2 divisors, whose sum is σ = 135247532. Its totient is φ = 135247530.

The previous prime is 135247439. The next prime is 135247537. The reversal of 135247531 is 135742531.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (135742531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135247531 - 2¹¹ = 135245483 is a prime.

It is a super-2 number, since 2×135247531² = 36583789283191922, 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 = 135247493 and 135247502.

It is not a weakly prime, because it can be changed into another prime (135247537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67623765 + 67623766.

It is an arithmetic number, because the mean of its divisors is an integer number (67623766).

Almost surely, 2^135247531 is an apocalyptic number.

135247531 is a deficient number, since it is larger than the sum of its proper divisors (1).

135247531 is an equidigital number, since it uses as much as digits as its factorization.

135247531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 135247531 is about 11629.5971985276. The cubic root of 135247531 is about 513.3061274257.

The spelling of 135247531 in words is "one hundred thirty-five million, two hundred forty-seven thousand, five hundred thirty-one".