38641591 has 2 divisors, whose sum is σ = 38641592. Its totient is φ = 38641590.

The previous prime is 38641553. The next prime is 38641597. The reversal of 38641591 is 19514683.

It is a strong prime.

It is an emirp because it is prime and its reverse (19514683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38641591 - 2¹¹ = 38639543 is a prime.

It is a super-2 number, since 2×38641591² = 2986345110022562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38641591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38641597) 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, 19320795 + 19320796.

It is an arithmetic number, because the mean of its divisors is an integer number (19320796).

Almost surely, 2^38641591 is an apocalyptic number.

38641591 is a deficient number, since it is larger than the sum of its proper divisors (1).

38641591 is an equidigital number, since it uses as much as digits as its factorization.

38641591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 38641591 is about 6216.2360798155. The cubic root of 38641591 is about 338.0791074481.

The spelling of 38641591 in words is "thirty-eight million, six hundred forty-one thousand, five hundred ninety-one".