135868551 has 32 divisors (see below), whose sum is σ = 229006848. Its totient is φ = 69724800.

The previous prime is 135868541. The next prime is 135868561. The reversal of 135868551 is 155868531.

It is an interprime number because it is at equal distance from previous prime (135868541) and next prime (135868561).

It is not a de Polignac number, because 135868551 - 2²¹ = 133771399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135868531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3376 + ... + 16826.

It is an arithmetic number, because the mean of its divisors is an integer number (7156464).

Almost surely, 2^135868551 is an apocalyptic number.

135868551 is a deficient number, since it is larger than the sum of its proper divisors (93138297).

135868551 is a wasteful number, since it uses less digits than its factorization.

135868551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13511.

The product of its digits is 144000, while the sum is 42.

The square root of 135868551 is about 11656.2665978434. The cubic root of 135868551 is about 514.0905821776.

The spelling of 135868551 in words is "one hundred thirty-five million, eight hundred sixty-eight thousand, five hundred fifty-one".