242145515 has 4 divisors (see below), whose sum is σ = 290574624. Its totient is φ = 193716408.

The previous prime is 242145511. The next prime is 242145559. The reversal of 242145515 is 515541242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515541242 = 2 ⋅257770621.

It is a cyclic number.

It is not a de Polignac number, because 242145515 - 2² = 242145511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242145511) 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, 24214547 + ... + 24214556.

It is an arithmetic number, because the mean of its divisors is an integer number (72643656).

Almost surely, 2^242145515 is an apocalyptic number.

242145515 is a deficient number, since it is larger than the sum of its proper divisors (48429109).

242145515 is an equidigital number, since it uses as much as digits as its factorization.

242145515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48429108.

The product of its digits is 8000, while the sum is 29.

The square root of 242145515 is about 15561.0255124783. The cubic root of 242145515 is about 623.2928473868.

Adding to 242145515 its reverse (515541242), we get a palindrome (757686757).

The spelling of 242145515 in words is "two hundred forty-two million, one hundred forty-five thousand, five hundred fifteen".