243400135251 has 48 divisors (see below), whose sum is σ = 409526488224. Its totient is φ = 127449616896.

The previous prime is 243400135247. The next prime is 243400135273. The reversal of 243400135251 is 152531004342.

It is not a de Polignac number, because 243400135251 - 2² = 243400135247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243400130251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 203040 + ... + 726653.

It is an arithmetic number, because the mean of its divisors is an integer number (8531801838).

Almost surely, 2^243400135251 is an apocalyptic number.

243400135251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

243400135251 is a deficient number, since it is larger than the sum of its proper divisors (166126352973).

243400135251 is a wasteful number, since it uses less digits than its factorization.

243400135251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929860 (or 929853 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 243400135251 its reverse (152531004342), we get a palindrome (395931139593).

The spelling of 243400135251 in words is "two hundred forty-three billion, four hundred million, one hundred thirty-five thousand, two hundred fifty-one".