255531429991 has 2 divisors, whose sum is σ = 255531429992. Its totient is φ = 255531429990.

The previous prime is 255531429953. The next prime is 255531430003. The reversal of 255531429991 is 199924135552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255531429991 - 2²⁷ = 255397212263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255531429091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127765714995 + 127765714996.

It is an arithmetic number, because the mean of its divisors is an integer number (127765714996).

Almost surely, 2^255531429991 is an apocalyptic number.

255531429991 is a deficient number, since it is larger than the sum of its proper divisors (1).

255531429991 is an equidigital number, since it uses as much as digits as its factorization.

255531429991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374000, while the sum is 55.

The spelling of 255531429991 in words is "two hundred fifty-five billion, five hundred thirty-one million, four hundred twenty-nine thousand, nine hundred ninety-one".