240842251 has 4 divisors (see below), whose sum is σ = 259368592. Its totient is φ = 222315912.

The previous prime is 240842249. The next prime is 240842267. The reversal of 240842251 is 152248042.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152248042 = 2 ⋅76124021.

It is not a de Polignac number, because 240842251 - 2¹ = 240842249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240842221) 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, 9263151 + ... + 9263176.

It is an arithmetic number, because the mean of its divisors is an integer number (64842148).

Almost surely, 2^240842251 is an apocalyptic number.

240842251 is a deficient number, since it is larger than the sum of its proper divisors (18526341).

240842251 is a wasteful number, since it uses less digits than its factorization.

240842251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18526340.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 240842251 is about 15519.0931113902. The cubic root of 240842251 is about 622.1726162492.

It can be divided in two parts, 24084 and 2251, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 240842251 in words is "two hundred forty million, eight hundred forty-two thousand, two hundred fifty-one".