285120021551 has 2 divisors, whose sum is σ = 285120021552. Its totient is φ = 285120021550.

The previous prime is 285120021533. The next prime is 285120021583. The reversal of 285120021551 is 155120021582.

It is an a-pointer prime, because the next prime (285120021583) can be obtained adding 285120021551 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 285120021551 - 2³⁸ = 10242114607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285120026551) 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, 142560010775 + 142560010776.

It is an arithmetic number, because the mean of its divisors is an integer number (142560010776).

Almost surely, 2^285120021551 is an apocalyptic number.

285120021551 is a deficient number, since it is larger than the sum of its proper divisors (1).

285120021551 is an equidigital number, since it uses as much as digits as its factorization.

285120021551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 32.

The spelling of 285120021551 in words is "two hundred eighty-five billion, one hundred twenty million, twenty-one thousand, five hundred fifty-one".