7638132391 has 2 divisors, whose sum is σ = 7638132392. Its totient is φ = 7638132390.

The previous prime is 7638132379. The next prime is 7638132409. The reversal of 7638132391 is 1932318367.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7638132391 - 2¹¹ = 7638130343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7638132311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819066195 + 3819066196.

It is an arithmetic number, because the mean of its divisors is an integer number (3819066196).

Almost surely, 2^7638132391 is an apocalyptic number.

7638132391 is a deficient number, since it is larger than the sum of its proper divisors (1).

7638132391 is an equidigital number, since it uses as much as digits as its factorization.

7638132391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 7638132391 is about 87396.4094857449. The cubic root of 7638132391 is about 1969.3779023799.

The spelling of 7638132391 in words is "seven billion, six hundred thirty-eight million, one hundred thirty-two thousand, three hundred ninety-one".