38190091 has 2 divisors, whose sum is σ = 38190092. Its totient is φ = 38190090.

The previous prime is 38190073. The next prime is 38190127. The reversal of 38190091 is 19009183.

It is a weak prime.

It is an emirp because it is prime and its reverse (19009183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38190091 - 2¹⁷ = 38059019 is a prime.

It is not a weakly prime, because it can be changed into another prime (38197091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19095045 + 19095046.

It is an arithmetic number, because the mean of its divisors is an integer number (19095046).

Almost surely, 2^38190091 is an apocalyptic number.

38190091 is a deficient number, since it is larger than the sum of its proper divisors (1).

38190091 is an equidigital number, since it uses as much as digits as its factorization.

38190091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 38190091 is about 6179.8131848786. The cubic root of 38190091 is about 336.7572060950.

The spelling of 38190091 in words is "thirty-eight million, one hundred ninety thousand, ninety-one".