242136511 has 4 divisors (see below), whose sum is σ = 246106024. Its totient is φ = 238167000.

The previous prime is 242136463. The next prime is 242136533. The reversal of 242136511 is 115631242.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115631242 = 2 ⋅57815621.

It is a cyclic number.

It is not a de Polignac number, because 242136511 - 2²⁵ = 208582079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242136581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984665 + ... + 1984786.

It is an arithmetic number, because the mean of its divisors is an integer number (61526506).

Almost surely, 2^242136511 is an apocalyptic number.

242136511 is a deficient number, since it is larger than the sum of its proper divisors (3969513).

242136511 is an equidigital number, since it uses as much as digits as its factorization.

242136511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969512.

The product of its digits is 1440, while the sum is 25.

The square root of 242136511 is about 15560.7361972369. The cubic root of 242136511 is about 623.2851217315.

Adding to 242136511 its reverse (115631242), we get a palindrome (357767753).

The spelling of 242136511 in words is "two hundred forty-two million, one hundred thirty-six thousand, five hundred eleven".