240138751 has 2 divisors, whose sum is σ = 240138752. Its totient is φ = 240138750.

The previous prime is 240138677. The next prime is 240138757. The reversal of 240138751 is 157831042.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 240138751 - 2²³ = 231750143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240138757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120069375 + 120069376.

It is an arithmetic number, because the mean of its divisors is an integer number (120069376).

Almost surely, 2^240138751 is an apocalyptic number.

240138751 is a deficient number, since it is larger than the sum of its proper divisors (1).

240138751 is an equidigital number, since it uses as much as digits as its factorization.

240138751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 240138751 is about 15496.4109070455. The cubic root of 240138751 is about 621.5662369021.

Adding to 240138751 its reverse (157831042), we get a palindrome (397969793).

The spelling of 240138751 in words is "two hundred forty million, one hundred thirty-eight thousand, seven hundred fifty-one".