243251252551 has 2 divisors, whose sum is σ = 243251252552. Its totient is φ = 243251252550.

The previous prime is 243251252501. The next prime is 243251252561. The reversal of 243251252551 is 155252152342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243251252551 - 2³³ = 234661317959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243251252551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243251252501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121625626275 + 121625626276.

It is an arithmetic number, because the mean of its divisors is an integer number (121625626276).

Almost surely, 2^243251252551 is an apocalyptic number.

243251252551 is a deficient number, since it is larger than the sum of its proper divisors (1).

243251252551 is an equidigital number, since it uses as much as digits as its factorization.

243251252551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120000, while the sum is 37.

The spelling of 243251252551 in words is "two hundred forty-three billion, two hundred fifty-one million, two hundred fifty-two thousand, five hundred fifty-one".