385290881 has 2 divisors, whose sum is σ = 385290882. Its totient is φ = 385290880.

The previous prime is 385290863. The next prime is 385290889. The reversal of 385290881 is 188092583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202094656 + 183196225 = 14216^2 + 13535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385290881 is a prime.

It is a super-2 number, since 2×385290881² = 296898125963512322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (385290889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192645440 + 192645441.

It is an arithmetic number, because the mean of its divisors is an integer number (192645441).

Almost surely, 2^385290881 is an apocalyptic number.

It is an amenable number.

385290881 is a deficient number, since it is larger than the sum of its proper divisors (1).

385290881 is an equidigital number, since it uses as much as digits as its factorization.

385290881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 385290881 is about 19628.8278050423. The cubic root of 385290881 is about 727.6618006301.

The spelling of 385290881 in words is "three hundred eighty-five million, two hundred ninety thousand, eight hundred eighty-one".