385501891 has 2 divisors, whose sum is σ = 385501892. Its totient is φ = 385501890.

The previous prime is 385501871. The next prime is 385501931. The reversal of 385501891 is 198105583.

It is an a-pointer prime, because the next prime (385501931) can be obtained adding 385501891 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 385501891 - 2¹³ = 385493699 is a prime.

It is a super-3 number, since 3×385501891³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (385501801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192750945 + 192750946.

It is an arithmetic number, because the mean of its divisors is an integer number (192750946).

Almost surely, 2^385501891 is an apocalyptic number.

385501891 is a deficient number, since it is larger than the sum of its proper divisors (1).

385501891 is an equidigital number, since it uses as much as digits as its factorization.

385501891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 385501891 is about 19634.2020718948. The cubic root of 385501891 is about 727.7946144793.

The spelling of 385501891 in words is "three hundred eighty-five million, five hundred one thousand, eight hundred ninety-one".