135856957 has 2 divisors, whose sum is σ = 135856958. Its totient is φ = 135856956.

The previous prime is 135856927. The next prime is 135856969. The reversal of 135856957 is 759658531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117375556 + 18481401 = 10834^2 + 4299^2 .

It is an emirp because it is prime and its reverse (759658531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135856957 - 2¹¹ = 135854909 is a prime.

It is a super-2 number, since 2×135856957² = 36914225530599698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135856957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135856927) 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 as a sum of consecutive naturals, namely, 67928478 + 67928479.

It is an arithmetic number, because the mean of its divisors is an integer number (67928479).

Almost surely, 2^135856957 is an apocalyptic number.

It is an amenable number.

135856957 is a deficient number, since it is larger than the sum of its proper divisors (1).

135856957 is an equidigital number, since it uses as much as digits as its factorization.

135856957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134000, while the sum is 49.

The square root of 135856957 is about 11655.7692581828. The cubic root of 135856957 is about 514.0759588873.

The spelling of 135856957 in words is "one hundred thirty-five million, eight hundred fifty-six thousand, nine hundred fifty-seven".