7848138491 has 2 divisors, whose sum is σ = 7848138492. Its totient is φ = 7848138490.

The previous prime is 7848138481. The next prime is 7848138497. The reversal of 7848138491 is 1948318487.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7848138491 - 2¹⁸ = 7847876347 is a prime.

It is not a weakly prime, because it can be changed into another prime (7848138497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3924069245 + 3924069246.

It is an arithmetic number, because the mean of its divisors is an integer number (3924069246).

Almost surely, 2^7848138491 is an apocalyptic number.

7848138491 is a deficient number, since it is larger than the sum of its proper divisors (1).

7848138491 is an equidigital number, since it uses as much as digits as its factorization.

7848138491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 53.

The square root of 7848138491 is about 88589.7200074591. The cubic root of 7848138491 is about 1987.2639428305.

The spelling of 7848138491 in words is "seven billion, eight hundred forty-eight million, one hundred thirty-eight thousand, four hundred ninety-one".