243251204551 has 8 divisors (see below), whose sum is σ = 251110941840. Its totient is φ = 235491591552.

The previous prime is 243251204527. The next prime is 243251204561. The reversal of 243251204551 is 155402152342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243251204551 - 2⁷ = 243251204423 is a prime.

It is a super-2 number, since 2×243251204551² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243251204561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25026136 + ... + 25035853.

It is an arithmetic number, because the mean of its divisors is an integer number (31388867730).

Almost surely, 2^243251204551 is an apocalyptic number.

243251204551 is a deficient number, since it is larger than the sum of its proper divisors (7859737289).

243251204551 is a wasteful number, since it uses less digits than its factorization.

243251204551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50062145.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 243251204551 its reverse (155402152342), we get a palindrome (398653356893).

The spelling of 243251204551 in words is "two hundred forty-three billion, two hundred fifty-one million, two hundred four thousand, five hundred fifty-one".