97638691 has 2 divisors, whose sum is σ = 97638692. Its totient is φ = 97638690.

The previous prime is 97638649. The next prime is 97638713. The reversal of 97638691 is 19683679.

It is a strong prime.

It is an emirp because it is prime and its reverse (19683679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97638691 - 2¹⁵ = 97605923 is a prime.

It is not a weakly prime, because it can be changed into another prime (97638601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48819345 + 48819346.

It is an arithmetic number, because the mean of its divisors is an integer number (48819346).

Almost surely, 2^97638691 is an apocalyptic number.

97638691 is a deficient number, since it is larger than the sum of its proper divisors (1).

97638691 is an equidigital number, since it uses as much as digits as its factorization.

97638691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 97638691 is about 9881.2292251521. The cubic root of 97638691 is about 460.4763355011.

The spelling of 97638691 in words is "ninety-seven million, six hundred thirty-eight thousand, six hundred ninety-one".