385591631 has 2 divisors, whose sum is σ = 385591632. Its totient is φ = 385591630.

The previous prime is 385591601. The next prime is 385591651. The reversal of 385591631 is 136195583.

It is a strong prime.

It is an emirp because it is prime and its reverse (136195583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 385591631 - 2¹⁸ = 385329487 is a prime.

It is a super-2 number, since 2×385591631² = 297361811794480322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385591601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192795815 + 192795816.

It is an arithmetic number, because the mean of its divisors is an integer number (192795816).

Almost surely, 2^385591631 is an apocalyptic number.

385591631 is a deficient number, since it is larger than the sum of its proper divisors (1).

385591631 is an equidigital number, since it uses as much as digits as its factorization.

385591631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 41.

The square root of 385591631 is about 19636.4872367743. The cubic root of 385591631 is about 727.8510839138.

The spelling of 385591631 in words is "three hundred eighty-five million, five hundred ninety-one thousand, six hundred thirty-one".