37638091 has 2 divisors, whose sum is σ = 37638092. Its totient is φ = 37638090.

The previous prime is 37638089. The next prime is 37638103. The reversal of 37638091 is 19083673.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 37638091 - 2¹ = 37638089 is a prime.

Together with 37638089, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 37638091.

It is not a weakly prime, because it can be changed into another prime (37638691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18819045 + 18819046.

It is an arithmetic number, because the mean of its divisors is an integer number (18819046).

Almost surely, 2^37638091 is an apocalyptic number.

37638091 is a deficient number, since it is larger than the sum of its proper divisors (1).

37638091 is an equidigital number, since it uses as much as digits as its factorization.

37638091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 37638091 is about 6134.9890790449. The cubic root of 37638091 is about 335.1268280454.

The spelling of 37638091 in words is "thirty-seven million, six hundred thirty-eight thousand, ninety-one".