38691491 has 2 divisors, whose sum is σ = 38691492. Its totient is φ = 38691490.

The previous prime is 38691463. The next prime is 38691493. The reversal of 38691491 is 19419683.

It is a strong prime.

It is an emirp because it is prime and its reverse (19419683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38691491 - 2⁶ = 38691427 is a prime.

Together with 38691493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38691493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19345745 + 19345746.

It is an arithmetic number, because the mean of its divisors is an integer number (19345746).

Almost surely, 2^38691491 is an apocalyptic number.

38691491 is a deficient number, since it is larger than the sum of its proper divisors (1).

38691491 is an equidigital number, since it uses as much as digits as its factorization.

38691491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 38691491 is about 6220.2484677061. The cubic root of 38691491 is about 338.2245715318.

The spelling of 38691491 in words is "thirty-eight million, six hundred ninety-one thousand, four hundred ninety-one".