38551691 has 2 divisors, whose sum is σ = 38551692. Its totient is φ = 38551690.

The previous prime is 38551661. The next prime is 38551717. The reversal of 38551691 is 19615583.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38551691 - 2¹⁰ = 38550667 is a prime.

It is not a weakly prime, because it can be changed into another prime (38551621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19275845 + 19275846.

It is an arithmetic number, because the mean of its divisors is an integer number (19275846).

Almost surely, 2^38551691 is an apocalyptic number.

38551691 is a deficient number, since it is larger than the sum of its proper divisors (1).

38551691 is an equidigital number, since it uses as much as digits as its factorization.

38551691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 38551691 is about 6209.0008052826. Note that the first 3 decimals coincide. The cubic root of 38551691 is about 337.8167225274.

The spelling of 38551691 in words is "thirty-eight million, five hundred fifty-one thousand, six hundred ninety-one".