285808735785431 has 2 divisors, whose sum is σ = 285808735785432. Its totient is φ = 285808735785430.

The previous prime is 285808735785361. The next prime is 285808735785473. The reversal of 285808735785431 is 134587537808582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285808735785431 is a prime.

It is a super-2 number, since 2×285808735785431² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285808735785731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142904367892715 + 142904367892716.

It is an arithmetic number, because the mean of its divisors is an integer number (142904367892716).

Almost surely, 2^{285808735785431} is an apocalyptic number.

285808735785431 is a deficient number, since it is larger than the sum of its proper divisors (1).

285808735785431 is an equidigital number, since it uses as much as digits as its factorization.

285808735785431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336000, while the sum is 74.

The spelling of 285808735785431 in words is "two hundred eighty-five trillion, eight hundred eight billion, seven hundred thirty-five million, seven hundred eighty-five thousand, four hundred thirty-one".