242545251 has 24 divisors (see below), whose sum is σ = 351351216. Its totient is φ = 148761600.

The previous prime is 242545243. The next prime is 242545253. The reversal of 242545251 is 152545242.

It is not a de Polignac number, because 242545251 - 2³ = 242545243 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (242545253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202711 + ... + 203903.

It is an arithmetic number, because the mean of its divisors is an integer number (14639634).

Almost surely, 2^242545251 is an apocalyptic number.

242545251 is a deficient number, since it is larger than the sum of its proper divisors (108805965).

242545251 is a wasteful number, since it uses less digits than its factorization.

242545251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1610 counting only the distinct ones).

The product of its digits is 16000, while the sum is 30.

The square root of 242545251 is about 15573.8643566714. The cubic root of 242545251 is about 623.6356379800.

Subtracting from 242545251 its reverse (152545242), we obtain a palindrome (90000009).

It can be divided in two parts, 2425452 and 51, that added together give a triangular number (2425503 = T₂₂₀₂).

The spelling of 242545251 in words is "two hundred forty-two million, five hundred forty-five thousand, two hundred fifty-one".