135517951 has 2 divisors, whose sum is σ = 135517952. Its totient is φ = 135517950.

The previous prime is 135517933. The next prime is 135517969. The reversal of 135517951 is 159715531.

It is a balanced prime because it is at equal distance from previous prime (135517933) and next prime (135517969).

It is an emirp because it is prime and its reverse (159715531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135517951 - 2⁵ = 135517919 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135517951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135517981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67758975 + 67758976.

It is an arithmetic number, because the mean of its divisors is an integer number (67758976).

Almost surely, 2^135517951 is an apocalyptic number.

135517951 is a deficient number, since it is larger than the sum of its proper divisors (1).

135517951 is an equidigital number, since it uses as much as digits as its factorization.

135517951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23625, while the sum is 37.

The square root of 135517951 is about 11641.2177627600. The cubic root of 135517951 is about 513.6480087930.

It can be divided in two parts, 1355 and 17951, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 135517951 in words is "one hundred thirty-five million, five hundred seventeen thousand, nine hundred fifty-one".